手电筒是使用Android手机的闪光灯，所以需添加权限<uses-permission android:name="android.permission.CAMERA" />
我测试的手机是三星I9300，正常，界面没有美化就有一个按钮，代码如下：
package com.jwzhangjie;
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;
/**
* 手电筒
* @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("关闭");
status = true;
new Thread(new TurnOnLight()).start();
}else {
status = false;
openLight.setText("打开");
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);
}
}
}