android將閃光燈作為手電筒的實現代碼

手電筒是使用Android手機的閃光燈，所以需添加權限<uses-permission android:name="android.permission.CAMERA" />

import com.jwzhangjie.test.R;

import android.app.Activity;

import android.hardware.Camera;

import android.hardware.Camera.Parameters;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;
/**

手電筒 
@author jwzhangjie 
*/

public class CameraLight extends Activity{
private Button openLight;

 private boolean status = false;

 private Camera camera;

 private Parameters parameters;

 private CameraLight instance;

 @Override

 protected void onCreate(Bundle savedInstanceState) {

 super.onCreate(savedInstanceState);  
 setContentView(R.layout.cameralight);  
 instance = this;  
 camera = Camera.open();  
 openLight = (Button)findViewById(R.id.openLight);  
 openLight.setOnClickListener(new OnClickListener() {  
     @Override  
     public void onClick(View v) {  
         if (!status) {  
             openLight.setText("關閉");  
             status = true;  
             new Thread(new TurnOnLight()).start();  
         }else {  
             status = false;  
             openLight.setText("打開");  
             instance.parameters.setFlashMode("off");  
             instance.camera.setParameters(instance.parameters);  
         }  
     }  
 });  


}



private class TurnOnLight implements Runnable{  
    @Override  
    public void run() {  
        instance.parameters = instance.camera.getParameters();  
        instance.parameters.setFlashMode("torch");  
        instance.camera.setParameters(instance.parameters);  
    }  
}  

}  </pre>