Android Notification LED Light Control LED燈 閃爍 控制

通知LED燈控制，測試有些手機可用，有些不可用，需在非充電下執行
1./res/layout/activity_main.xml

2.MainActivity.java

package tw.android;

import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {

 private NotificationManager notificationManager;
 private Notification notification;
 private boolean indeterminate = true; // true-開啟, false-關閉
 private int msInterval = 850; // 閃爍間隔時間(毫秒)

 private Button btStart, btStop;

 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
  notification = new Notification();
  
  /* 啟用通知的led燈 */
  notification.flags = Notification.FLAG_SHOW_LIGHTS;
  /*notification閃亮間隔時間 */
  notification.ledOnMS=100; 
  notification.ledOffMS=100;

  btStart = (Button) findViewById(R.id.btStart);
  btStop = (Button) findViewById(R.id.btStop);

  /* 開始 */
  btStart.setOnClickListener(new OnClickListener() {

   public void onClick(View v) {
    indeterminate = true;// 設為開啟
    new TwoColorBlink().execute(); // 執行LED燈閃爍

    btStart.setEnabled(false); // 開始按鈕-不可按
    btStop.setEnabled(true); // 關閉按鈕-可按

   }
  });

  /* 停止 */
  btStop.setOnClickListener(new OnClickListener() {

   public void onClick(View v) {

    indeterminate = false;// 設為關閉
    notificationManager.cancel(0); // 關閉notificationManager

    btStart.setEnabled(true); // 開始按鈕-可按
    btStop.setEnabled(false); // 關閉按鈕-不可按
   }
  });

 }

 @Override
 protected void onPause() {
  indeterminate = false; // 設為關閉
  notificationManager.cancel(0); // 關閉notificationManager
  super.onPause();
 }

 private class TwoColorBlink extends AsyncTask<Void, Void, Void> {

  private int counter = 0; // 初始化次數

  @Override
  protected void onPreExecute() {

  }

  @Override
  protected Void doInBackground(Void... arg0) {
   try {

    synchronized (this) { //同一時間只有一個Thread執行
     
     notification.ledARGB = 0xFFFF0000;// 設定LED燈開始顏色

     while (indeterminate) { //重複閃爍

      notificationManager.notify(0, notification);//開啟notificationManager

      this.wait(msInterval); //閃爍間隔時間

      notificationManager.cancel(0); //關閉notificationManager

      if (counter++ % 2 == 0) {
       notification.ledARGB = 0xFF00FF00; //切換綠色
      } else {
       notification.ledARGB = 0xFF0000FF; //切換藍色
      }
      
     }

    }
   } catch (InterruptedException e) {
    e.printStackTrace();
   }
   return null;
  }

  @Override
  protected void onPostExecute(Void result) {
   

  }

 }

}

檔按下載:https://github.com/terryyamg/LedTest
參考來源:http://www.41post.com/4706/programming/android-creating-a-two-color-led-notification

Android Output Write File 輸出 寫入 文件

有時候字串太長，LogCat不好顯示，輸出文件是個好方法。
1.AndroidManifest.xml加入權限

2./res/layout/activity_main.xml

3.Write.java

package tw.android;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

import android.content.Context;
import android.os.Environment;
import android.util.Log;
import android.widget.Toast;

public class Write {
 private static Context context;

 public Write(Context context) {
  this.context = context;
 }
 
 public static void WriteFileExample(String message) {
  FileOutputStream fop = null;
  File file;
  String content = message;

  try {
   File sdcard = Environment.getExternalStorageDirectory();
   file = new File(sdcard, context.getResources().getString(R.string.app_name)+"Log.txt"); //輸出檔案位置
   Log.i("Write File:", file + "");
   fop = new FileOutputStream(file);
   
   if (!file.exists()) { // 如果檔案不存在，建立檔案
    file.createNewFile();
   }

   byte[] contentInBytes = content.getBytes();// 取的字串內容bytes

   fop.write(contentInBytes); //輸出
   fop.flush();
   fop.close();

   Toast.makeText(context, "輸出完成", Toast.LENGTH_LONG).show();
   
  } catch (IOException e) {
   Log.i("Write E:", e + "");
   e.printStackTrace();
  } finally {
   try {
    if (fop != null) {
     fop.close();
    }
   } catch (IOException e) {
    Log.i("Write IOException", e + "");
    e.printStackTrace();
   }
  }
 }
}

4.MainActivity.java

package tw.android;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity {
 private EditText etWrite;
 private Button btWrite;
 private Write write = new Write(MainActivity.this);

 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  etWrite = (EditText) findViewById(R.id.etWrite);
  btWrite = (Button) findViewById(R.id.btWrite);

  btWrite.setOnClickListener(new Button.OnClickListener() {
   public void onClick(View v) {

    write.WriteFileExample(etWrite.getText().toString()); // 寫入輸入文字
   }
  });

 }
}

檔案下載:
https://github.com/terryyamg/WriteFileTest
參考連結:
http://www.mkyong.com/java/how-to-write-to-file-in-java-fileoutputstream-example/

Android Get Phone WIFI IP 取得 網路 IP

取得手機或WIFI的IP位址
1.AndroidManifest.xml加入權限

2./res/layout/activity_main.xml

3.Utils.java

package tw.android;

import java.io.*;
import java.net.*;
import java.util.*;   
import org.apache.http.conn.util.InetAddressUtils;

public class Utils {

    /**
     * Convert byte array to hex string
     * @param bytes
     * @return
     */
    public static String bytesToHex(byte[] bytes) {
        StringBuilder sbuf = new StringBuilder();
        for(int idx=0; idx < bytes.length; idx++) {
            int intVal = bytes[idx] & 0xff;
            if (intVal < 0x10) sbuf.append("0");
            sbuf.append(Integer.toHexString(intVal).toUpperCase());
        }
        return sbuf.toString();
    }

    /**
     * Get utf8 byte array.
     * @param str
     * @return  array of NULL if error was found
     */
    public static byte[] getUTF8Bytes(String str) {
        try { return str.getBytes("UTF-8"); } catch (Exception ex) { return null; }
    }

    /**
     * Load UTF8withBOM or any ansi text file.
     * @param filename
     * @return  
     * @throws java.io.IOException
     */
    public static String loadFileAsString(String filename) throws java.io.IOException {
        final int BUFLEN=1024;
        BufferedInputStream is = new BufferedInputStream(new FileInputStream(filename), BUFLEN);
        try {
            ByteArrayOutputStream baos = new ByteArrayOutputStream(BUFLEN);
            byte[] bytes = new byte[BUFLEN];
            boolean isUTF8=false;
            int read,count=0;           
            while((read=is.read(bytes)) != -1) {
                if (count==0 && bytes[0]==(byte)0xEF && bytes[1]==(byte)0xBB && bytes[2]==(byte)0xBF ) {
                    isUTF8=true;
                    baos.write(bytes, 3, read-3); // drop UTF8 bom marker
                } else {
                    baos.write(bytes, 0, read);
                }
                count+=read;
            }
            return isUTF8 ? new String(baos.toByteArray(), "UTF-8") : new String(baos.toByteArray());
        } finally {
            try{ is.close(); } catch(Exception ex){} 
        }
    }

    /**
     * Returns MAC address of the given interface name.
     * @param interfaceName eth0, wlan0 or NULL=use first interface 
     * @return  mac address or empty string
     */
    public static String getMACAddress(String interfaceName) {
        try {
            List<NetworkInterface> interfaces = Collections.list(NetworkInterface.getNetworkInterfaces());
            for (NetworkInterface intf : interfaces) {
                if (interfaceName != null) {
                    if (!intf.getName().equalsIgnoreCase(interfaceName)) continue;
                }
                byte[] mac = intf.getHardwareAddress();
                if (mac==null) return "";
                StringBuilder buf = new StringBuilder();
                for (int idx=0; idx<mac.length; idx++)
                    buf.append(String.format("%02X:", mac[idx]));       
                if (buf.length()>0) buf.deleteCharAt(buf.length()-1);
                return buf.toString();
            }
        } catch (Exception ex) { } // for now eat exceptions
        return "";
        /*try {
            // this is so Linux hack
            return loadFileAsString("/sys/class/net/" +interfaceName + "/address").toUpperCase().trim();
        } catch (IOException ex) {
            return null;
        }*/
    }

    /**
     * Get IP address from first non-localhost interface
     * @param ipv4  true=return ipv4, false=return ipv6
     * @return  address or empty string
     */
    public static String getIPAddress(boolean useIPv4) {
        try {
            List<NetworkInterface> interfaces = Collections.list(NetworkInterface.getNetworkInterfaces());
            for (NetworkInterface intf : interfaces) {
                List<InetAddress> addrs = Collections.list(intf.getInetAddresses());
                for (InetAddress addr : addrs) {
                    if (!addr.isLoopbackAddress()) {
                        String sAddr = addr.getHostAddress().toUpperCase();
                        boolean isIPv4 = InetAddressUtils.isIPv4Address(sAddr); 
                        if (useIPv4) {
                            if (isIPv4) 
                                return sAddr;
                        } else {
                            if (!isIPv4) {
                                int delim = sAddr.indexOf('%'); // drop ip6 port suffix
                                return delim<0 ? sAddr : sAddr.substring(0, delim);
                            }
                        }
                    }
                }
            }
        } catch (Exception ex) { } // for now eat exceptions
        return "";
    }

}

4.MainActivity.java

package tw.android;

import android.app.Activity;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.text.format.Formatter;
import android.widget.TextView;

public class MainActivity extends Activity {
 private TextView tvMac, tvWifi, tvIPV4, tvIPV6;

 /** Called when the activity is first created. */

 @SuppressWarnings("deprecation")
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  tvMac = (TextView) findViewById(R.id.tvMac);
  tvWifi = (TextView) findViewById(R.id.tvWifi);
  tvIPV4 = (TextView) findViewById(R.id.tvIPV4);
  tvIPV6 = (TextView) findViewById(R.id.tvIPV6);

  /* wifi ip位址 */
  WifiManager wm = (WifiManager) getSystemService(WIFI_SERVICE);
  String adWifi = Formatter.formatIpAddress(wm.getConnectionInfo()
    .getIpAddress());
  
  /* 手機網路ip位址 */
  String adMac = Utils.getMACAddress("wlan0");
  String ipv4 = Utils.getIPAddress(true); // IPv4
  String ipv6 = Utils.getIPAddress(true); // IPv6

  tvMac.setText(adMac);
  tvWifi.setText(adWifi);
  tvIPV4.setText(ipv4);
  tvIPV6.setText(ipv6);

 }
}

參考來源:
http://stackoverflow.com/questions/6064510/how-to-get-ip-address-of-the-device

Android Internet Time 取得 網路 時間

Candy Crush APP就是抓取手機的時間，所以修改手機時間能獲得能量，有些APP則不能，因為抓取的為網路時間
1.AndroidManifest.xml加入網路權限

2.下載commons-net-3.1.jar
在專案建立libs資料夾，放至libs資料夾裡面

3./res/layout/activity_main.xml

4.MainActivity.java

package tw.android;

import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.apache.commons.net.time.TimeTCPClient;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.StrictMode;
import android.provider.Settings;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {
 private TextView tvPhoneTime, tvInternetTime;
 private Button btUpdateTime, btChangeTime;

 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
    .detectDiskReads().detectDiskWrites().detectNetwork()
    .penaltyLog().build());
  StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder()
    .detectLeakedSqlLiteObjects().penaltyLog().penaltyDeath()
    .build());

  tvPhoneTime = (TextView) findViewById(R.id.tvPhoneTime);
  tvInternetTime = (TextView) findViewById(R.id.tvInternetTime);
  btUpdateTime = (Button) findViewById(R.id.btUpdateTime);
  btChangeTime = (Button) findViewById(R.id.btChangeTime);

  /* 更新時間 */
  btUpdateTime.setOnClickListener(new Button.OnClickListener() {
   public void onClick(View v) {
    updateTime();
   }
  });

  /* 前往修改手機時間 */
  btChangeTime.setOnClickListener(new Button.OnClickListener() {
   public void onClick(View v) {
    Intent intent = new Intent(Settings.ACTION_DATE_SETTINGS);
    startActivity(intent);
   }
  });
 }

 @SuppressLint("SimpleDateFormat")
 private void updateTime() {
  /* 手機時間 */
  SimpleDateFormat sTime = new SimpleDateFormat("HH:mm:ss");
  String time = sTime.format(new java.util.Date()); // 現在時間
  tvPhoneTime.setText(time);

  /* 網路時間 */
  try {
   TimeTCPClient client = new TimeTCPClient();
   try {
    client.setDefaultTimeout(60000); // 設定最長等待時間為60秒
    /* 可以前往 http://tf.nist.gov/tf-cgi/servers.cgi 選擇可用的連結點 */
    client.connect("time-nw.nist.gov"); // 取得網路時間
    String iT = sTime.format(client.getDate());// 格式處理

    tvInternetTime.setText(iT);
   } finally {
    client.disconnect(); // 關掉連結
   }
  } catch (IOException e) {
   e.printStackTrace();
  }

 }

}

檔案下載:
 https://github.com/terryyamg/InternetTimeTest
參考連結:
http://stackoverflow.com/questions/13064750/how-to-get-current-time-from-internet-in-android
http://tf.nist.gov/tf-cgi/servers.cgi
http://grepcode.com/snapshot/repo1.maven.org/maven2/commons-net/commons-net/3.1

Android Load Image From Camera Or Gallery 讀取照片從相機或圖片庫

利用相機拍照或從已經存在的圖片庫，讀取照片並紀錄，將其顯示在app上。
1.AndroidManifest.xml加入讀取與寫入權限

2./res/layout/activity_main.xml

3.MainActivity.java

package tw.android;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.provider.MediaStore.MediaColumns;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends Activity {

 private Button btnSelect;
 private ImageView ivImage;

 private int REQUEST_CAMERA = 0, SELECT_FILE = 1;
 private String selectedImagePath; // 圖片檔案位置

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  btnSelect = (Button) findViewById(R.id.btnSelectPhoto);
  ivImage = (ImageView) findViewById(R.id.ivImage);

  // 取出最後圖片檔案位置
  try {
   SharedPreferences preferencesGet = getApplicationContext()
     .getSharedPreferences("image",
       android.content.Context.MODE_PRIVATE);
   selectedImagePath = preferencesGet.getString("selectedImagePath",
     ""); // 圖片檔案位置，預設為空

   Log.i("selectedImagePath", selectedImagePath + "");

  } catch (Exception e) {
  }

  /* 選擇照片 */
  btnSelect.setOnClickListener(new OnClickListener() {

   public void onClick(View v) {
    selectImage();
   }
  });

  setImage();
 }

 /* 設定圖片 */
 private void setImage() {
  BitmapFactory.Options options = new BitmapFactory.Options();
  options.inJustDecodeBounds = false; // 不顯示照片
  BitmapFactory.decodeFile(selectedImagePath, options);
  final int REQUIRED_SIZE = 200;
  int scale = 1;
  /* 圖片縮小2倍 */
  while (options.outWidth / scale / 2 >= REQUIRED_SIZE
    && options.outHeight / scale / 2 >= REQUIRED_SIZE) {
   scale *= 2;
  }
  options.inSampleSize = scale;
  options.inJustDecodeBounds = false; // 顯示照片
  Bitmap bm = BitmapFactory.decodeFile(selectedImagePath, options);
  Log.i("selectedImagePath", selectedImagePath + "");
  ivImage.setImageBitmap(bm);// 將圖片顯示
 }

 private void selectImage() {
  final String item1, item2, item3;
  item1 = "拍一張照";
  item2 = "從圖庫選取";
  item3 = "取消";

  final CharSequence[] items = { item1, item2, item3 };

  AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
  builder.setTitle("新增照片視窗");
  builder.setItems(items, new DialogInterface.OnClickListener() {
   public void onClick(DialogInterface dialog, int item) {
    switch (item) {
    case 0: // 拍一張照
     Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
     startActivityForResult(intent, REQUEST_CAMERA);
     break;
    case 1: // 從圖庫選取
     Intent intent1 = new Intent(
       Intent.ACTION_PICK,
       android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
     intent1.setType("image/*");
     startActivityForResult(
       Intent.createChooser(intent1, "選擇開啟圖庫"),
       SELECT_FILE);
     break;
    default: // 取消
     dialog.dismiss(); // 關閉對畫框
     break;
    }

   }
  });
  builder.show();
 }

 /* 啟動選擇方式 */
 @Override
 public void onActivityResult(int requestCode, int resultCode, Intent data) {
  super.onActivityResult(requestCode, resultCode, data);

  if (resultCode == Activity.RESULT_OK) {
   if (requestCode == SELECT_FILE) // 從圖庫開啟
    onSelectFromGalleryResult(data);
   else if (requestCode == REQUEST_CAMERA) // 拍照
    onCaptureImageResult(data);
  }
 }

 /* 拍照 */
 private void onCaptureImageResult(Intent data) {
  Bitmap thumbnail = (Bitmap) data.getExtras().get("data");
  ByteArrayOutputStream bytes = new ByteArrayOutputStream();
  thumbnail.compress(Bitmap.CompressFormat.JPEG, 90, bytes);
  File destination = new File(Environment.getExternalStorageDirectory(),
    System.currentTimeMillis() + ".jpg"); // 輸出檔案名稱
  selectedImagePath = destination + ""; // 輸出檔案位置
  FileOutputStream fo;
  try {
   destination.createNewFile(); // 建立檔案
   fo = new FileOutputStream(destination); // 輸出
   fo.write(bytes.toByteArray());
   fo.close();
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }

  ivImage.setImageBitmap(thumbnail); // 將圖片顯示
 }

 @SuppressWarnings("deprecation")
 private void onSelectFromGalleryResult(Intent data) {
  Uri selectedImageUri = data.getData();
  String[] projection = { MediaColumns.DATA };
  Cursor cursor = managedQuery(selectedImageUri, projection, null, null,
    null);
  int column_index = cursor.getColumnIndexOrThrow(MediaColumns.DATA);
  cursor.moveToFirst();

  selectedImagePath = cursor.getString(column_index); // 選擇的照片位置

  setImage(); // 設定圖片
 }

 /* 結束時 */
 @Override
 protected void onDestroy() {
  super.onDestroy();
  /* 紀錄圖片檔案位置 */
  SharedPreferences preferencesSave = getApplicationContext()
    .getSharedPreferences("image",
      android.content.Context.MODE_PRIVATE);
  SharedPreferences.Editor editor = preferencesSave.edit();
  editor.putString("selectedImagePath", selectedImagePath); // 紀錄最後圖片位置
  editor.commit();

  Log.i("onDestroy", "onDestroy");
 }

}

檔案下載:
https://github.com/terryyamg/loadImageFromGalleryTest
參考來源:
http://www.theappguruz.com/blog/android-take-photo-camera-gallery-code-sample/

Android Set Volume Switch SeekBar 設定 音量 大小 開關

app中設定音樂開關與大小相關設定，不影響原手機音樂大小設定的方法。
1.AndroidManifest.xml版本設定為
android:minSdkVersion="14"
switch元件需要版本14以上
2./res/layout/activity_main.xml

2.MainActivity.java

package tw.android;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.media.AudioManager;
import android.os.Bundle;
import android.util.Log;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.Switch;
import android.widget.TextView;

public class MainActivity extends Activity {
 private Switch switchVolume; // 開關

 private SeekBar mediaVlmSeekBar = null; // 音樂、影片、遊戲及其他媒體

 private SeekBar ringerVlmSeekBar = null; // 鈴聲

 private SeekBar alarmVlmSeekBar = null; // 鬧鐘

 private SeekBar notifyVlmSeekBar = null; // 通知

 private AudioManager audioManager = null;

 private TextView tv1, tv2, tv3, tv4;

 private boolean setSwitch;
 private int originalMedia, originalRinger, originalAlarm, originalNotify,
   setMedia, setRinger, setAlarm, setNotify;

 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);

  /* 權限 */
  this.setVolumeControlStream(AudioManager.STREAM_MUSIC);
  this.setVolumeControlStream(AudioManager.STREAM_RING);
  this.setVolumeControlStream(AudioManager.STREAM_ALARM);
  this.setVolumeControlStream(AudioManager.STREAM_NOTIFICATION);

  setContentView(R.layout.activity_main);

  initControls();
 }

 @SuppressLint("InlinedApi")
 private void initControls() {
  // Return the handle to a system-level service - 'AUDIO'.
  audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
  /* 手機原設定音量大小 */
  originalMedia = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
  originalRinger = audioManager.getStreamVolume(AudioManager.STREAM_RING);
  originalAlarm = audioManager.getStreamVolume(AudioManager.STREAM_ALARM);
  originalNotify = audioManager
    .getStreamVolume(AudioManager.STREAM_NOTIFICATION);

  // 取出最後設定音量大小
  try {
   SharedPreferences preferencesGet = getApplicationContext()
     .getSharedPreferences("vol",
       android.content.Context.MODE_PRIVATE);
   setSwitch = preferencesGet.getBoolean("setSwitch", false);// 預設開關為關閉
   setMedia = preferencesGet.getInt("setMedia", originalMedia); // 預設音量大小
   setRinger = preferencesGet.getInt("setRinger", originalRinger);
   setAlarm = preferencesGet.getInt("setAlarm", originalAlarm);
   setNotify = preferencesGet.getInt("setNotify", originalNotify);

   Log.i("setSwitch", setSwitch + "");
   Log.i("setMedia", setMedia + "");
   Log.i("setRinger", setRinger + "");
   Log.i("setAlarm", setAlarm + "");
   Log.i("setNotify", setNotify + "");
  } catch (Exception e) {
  }

  /* 開關 */
  switchVolume = (Switch) findViewById(R.id.switchVolume);
  switchVolume.setChecked(setSwitch); // 預設開關為關閉

  /* 音樂、影片、遊戲及其他媒體 */
  mediaVlmSeekBar = (SeekBar) findViewById(R.id.seekBar1);
  tv1 = (TextView) findViewById(R.id.tv1);
  mediaVlmSeekBar.setMax(audioManager
    .getStreamMaxVolume(AudioManager.STREAM_MUSIC)); // 最大值

  /* 鈴聲 */
  ringerVlmSeekBar = (SeekBar) findViewById(R.id.seekBar2);
  tv2 = (TextView) findViewById(R.id.tv2);
  ringerVlmSeekBar.setMax(audioManager
    .getStreamMaxVolume(AudioManager.STREAM_RING));

  /* 鬧鐘 */
  alarmVlmSeekBar = (SeekBar) findViewById(R.id.seekBar3);
  tv3 = (TextView) findViewById(R.id.tv3);
  alarmVlmSeekBar.setMax(audioManager
    .getStreamMaxVolume(AudioManager.STREAM_ALARM));

  /* 通知 */
  notifyVlmSeekBar = (SeekBar) findViewById(R.id.seekBar4);
  tv4 = (TextView) findViewById(R.id.tv4);
  notifyVlmSeekBar.setMax(audioManager
    .getStreamMaxVolume(AudioManager.STREAM_NOTIFICATION));

  /* 設定音量大小 */
  mediaVlmSeekBar.setProgress(setMedia);
  ringerVlmSeekBar.setProgress(setRinger);
  alarmVlmSeekBar.setProgress(setAlarm);
  notifyVlmSeekBar.setProgress(setNotify);

  /* 開關動作 */
  if (setSwitch) {
   tv1.setText(audioManager
     .getStreamMaxVolume(AudioManager.STREAM_MUSIC) + "");// 顯示大小
  } else {
   tv1.setText("0");// 顯示大小
  }

  switchVolume.setOnCheckedChangeListener(new OnCheckedChangeListener() {

   public void onCheckedChanged(CompoundButton buttonView,
     boolean isChecked) {

    if (isChecked) { // 開啟
     mediaVlmSeekBar.setProgress(audioManager
       .getStreamMaxVolume(AudioManager.STREAM_MUSIC)); // 設到最大
     setMedia = audioManager
       .getStreamMaxVolume(AudioManager.STREAM_MUSIC);
     setSwitch = true;
    } else { // 關閉
     mediaVlmSeekBar.setProgress(0); // 設到最小
     setMedia = 0;
     setSwitch = false;
    }

   }
  });

  try {
   /* 音樂、影片、遊戲及其他媒體 */
   mediaVlmSeekBar
     .setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
      // seekbar停止時動作
      public void onStopTrackingTouch(SeekBar arg0) {
      }

      // seekbar開始前時動作
      public void onStartTrackingTouch(SeekBar arg0) {
      }

      // seekbar改變時動作
      public void onProgressChanged(SeekBar arg0,
        int progress, boolean arg2) {
       tv1.setText(progress + "");// 顯示大小
       audioManager.setStreamVolume(
         AudioManager.STREAM_MUSIC, progress, 0);
       setMedia = progress; // 修改預設值為選定大小
      }
     });

   /* 鈴聲 */
   ringerVlmSeekBar
     .setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
      public void onStopTrackingTouch(SeekBar arg0) {
      }

      public void onStartTrackingTouch(SeekBar arg0) {
      }

      public void onProgressChanged(SeekBar arg0,
        int progress, boolean arg2) {
       tv2.setText(progress + "");// 顯示大小
       audioManager.setStreamVolume(
         AudioManager.STREAM_RING, progress, 0);
       setRinger = progress; // 修改預設值為選定大小
      }
     });

   /* 鬧鐘 */
   alarmVlmSeekBar
     .setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
      public void onStopTrackingTouch(SeekBar arg0) {
      }

      public void onStartTrackingTouch(SeekBar arg0) {
      }

      public void onProgressChanged(SeekBar arg0,
        int progress, boolean arg2) {
       tv3.setText(progress + "");// 顯示大小
       audioManager.setStreamVolume(
         AudioManager.STREAM_ALARM, progress, 0);
       setAlarm = progress; // 修改預設值為選定大小
      }
     });

   /* 通知 */
   notifyVlmSeekBar
     .setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
      public void onStopTrackingTouch(SeekBar arg0) {
      }

      public void onStartTrackingTouch(SeekBar arg0) {
      }

      public void onProgressChanged(SeekBar arg0,
        int progress, boolean arg2) {
       tv4.setText(progress + "");// 顯示大小
       audioManager.setStreamVolume(
         AudioManager.STREAM_NOTIFICATION, progress,
         0);
       setNotify = progress; // 修改預設值為選定大小
      }
     });
  } catch (Exception e) {
   e.printStackTrace();
  }
 }

 /* 結束時 */
 @Override
 protected void onDestroy() {
  super.onDestroy();
  /* 紀錄設定音量大小 */
  SharedPreferences preferencesSave = getApplicationContext()
    .getSharedPreferences("vol",
      android.content.Context.MODE_PRIVATE);
  SharedPreferences.Editor editor = preferencesSave.edit();
  editor.putBoolean("setSwitch", setSwitch);
  editor.putInt("setMedia", setMedia);
  editor.putInt("setRinger", setRinger);
  editor.putInt("setAlarm", setAlarm);
  editor.putInt("setNotify", setNotify);
  editor.commit();
  /* 還原手機原設定音量大小 */
  audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, originalMedia,
    0);
  audioManager.setStreamVolume(AudioManager.STREAM_RING, originalRinger,
    0);
  audioManager.setStreamVolume(AudioManager.STREAM_ALARM, originalAlarm,
    0);
  audioManager.setStreamVolume(AudioManager.STREAM_NOTIFICATION,
    originalNotify, 0);
  Log.i("onDestroy", "onDestroy");
 }

}

檔案下載:
https://github.com/terryyamg/seekBarVolumeTest
參考連結:
http://programmerguru.com/android-tutorial/android-seekbar-example/
http://www.mysamplecode.com/2013/04/android-switch-button-example.html

Android Load Image From Url 讀取網址照片

從網址上讀取圖片，仿ptt app讀圖片功能
1.AndroidManifest.xml加入網路權限

2./res/layout/activity_main.xml

3.MainActivity.java

package tw.android;

import java.io.InputStream;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends Activity {

 private Button btUrl, btLoad;
 private String url;

 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  btUrl = (Button) findViewById(R.id.btUrl);
  btLoad = (Button) findViewById(R.id.btLoad);

  /* 顯示url */

  url = "http://i.imgur.com/WPydEEx.jpg"; // 圖片網址
  btUrl.setText(url); // 顯示網址
  btUrl.setOnClickListener(new Button.OnClickListener() {
   public void onClick(View v) {
    Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri
      .parse(url));
    startActivity(browserIntent); // 使用網頁開啟
   }
  });

  /* 下載圖片 */
  btLoad.setOnClickListener(new Button.OnClickListener() {
   public void onClick(View v) {
    btLoad.setVisibility(View.GONE); // 隱藏按鈕
    new DownloadImageTask((ImageView) findViewById(R.id.ivLoad))
      .execute(url); // 載入圖片

   }
  });

 }

 /* AsyncTask執行下載任務 */
 @SuppressLint("NewApi")
 private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
  ImageView bmImage;

  public DownloadImageTask(ImageView bmImage) {
   this.bmImage = bmImage;
  }

  protected Bitmap doInBackground(String... urls) {
   String urldisplay = urls[0];
   Bitmap mIcon11 = null;
   try {
    InputStream in = new java.net.URL(urldisplay).openStream(); // 從網址上下載
    mIcon11 = BitmapFactory.decodeStream(in);
   } catch (Exception e) {
    Log.e("Error", e.getMessage());
    e.printStackTrace();
   }
   return mIcon11;
  }

  protected void onPostExecute(Bitmap result) {
   bmImage.setImageBitmap(result); // 下載完成後載入結果
  }
 }
}

參考網址:
http://stackoverflow.com/questions/5776851/load-image-from-url