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/