Android camera flashlight 相機閃光燈

簡易手電筒app，開啟相機的閃光燈
1.AndroidManifest.xml 加入
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />

2.main.xml

2.MainActivity.java

package com.prgguru.com;

import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {
 private boolean isFlashOn = false; //預設開關-關閉
 private Camera camera;
 private Button button;

 @Override
 protected void onStop() {
  super.onStop();

  if (camera != null) {
   camera.release();
  }
 }

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  button = (Button) findViewById(R.id.buttonFlashlight);
  Context context = this;
  PackageManager pm = context.getPackageManager();

  
  if (!pm.hasSystemFeature(PackageManager.FEATURE_CAMERA)) { //判斷有無相機
   Toast.makeText(getApplicationContext(),
     "抱歉，您的手機無相機功能",
     Toast.LENGTH_SHORT).show();

   return;
  }

  camera = Camera.open();
  final Parameters p = camera.getParameters();

  button.setOnClickListener(new OnClickListener() {
   public void onClick(View arg0) {
    if (isFlashOn) { //false 關閉
     p.setFlashMode(Parameters.FLASH_MODE_OFF); //相機閃光燈模式
     camera.setParameters(p);     
     isFlashOn = false;
     button.setText("打開");
    } else { // true 開啟
     Log.i("info", "torch is turned on!");
     p.setFlashMode(Parameters.FLASH_MODE_TORCH); //相機閃光燈模式
     camera.setParameters(p);     
     isFlashOn = true;
     button.setText("關閉");
    }
   }
  });

 }
}

參考來源: http://programmerguru.com/android-tutorial/android-flashlight-example/