正文
Android 打开闪光灯（手电筒）
提示：扫一扫查出行【扫一扫了解最新限行尾号】
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package com.example.openBackLight;import android.app.Activity;
import android.hardware.Camera;
import android.os.Bundle;
import android.view.View;
import android.hardware.Camera.Parameters;
import android.widget.Button;public class MyActivity extends Activity {
private Button button;
private Camera camera;
private Parameters parameters;
public boolean hasClosed = true; // 定义开关状态，状态为false，打开状态，状态为true，关闭状态 @Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main); button = (Button) findViewById(R.id.button);
} public void toggleLight(View view) {
if (hasClosed) {
camera = Camera.open();
parameters = camera.getParameters();
parameters.setFlashMode(Parameters.FLASH_MODE_TORCH);// 开启
camera.setParameters(parameters);
button.setText("关闭闪光灯");
hasClosed = false;
} else {
parameters.setFlashMode(Parameters.FLASH_MODE_OFF);// 关闭
camera.setParameters(parameters);
button.setText("开启闪光灯");
hasClosed = true;
camera.release();
}
}}
布局文件很简单，就一个button，点击的时候会调用toggleLight()方法.
要加入以下权限：
<uses-permission android:name="android.permission.FLASHLIGHT" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
