一起学android之如何以最简单方式开启闪光灯（35）

我们以360手机助手中有一款叫“最美手电筒”，效果图：

通过图中手电筒的开关来开启或关闭闪光灯，OK，以下是实现此功能的代码：

public class MainActivity extends Activity implements OnClickListener {private ImageView iv_off_on;private ImageView iv_light;private Parameters parameter = null;private Camera camera = null;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.activity_main);initView();initListener();}private void initListener() {iv_off_on.setOnClickListener(this);}private void initView() {iv_off_on = (ImageView) findViewById(R.id.iv_off_on);iv_light = (ImageView) findViewById(R.id.iv_light);iv_light.setVisibility(View.INVISIBLE);}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.iv_off_on:if (iv_off_on.isSelected()) {// 关闭iv_off_on.setSelected(false);iv_light.setVisibility(View.INVISIBLE);parameter.setFlashMode(Parameters.FLASH_MODE_OFF);camera.setParameters(parameter);camera.release();} else {// 开启iv_off_on.setSelected(true);iv_light.setVisibility(View.VISIBLE);camera = Camera.open();camera.startPreview();parameter = camera.getParameters();parameter.setFlashMode(Parameters.FLASH_MODE_TORCH);camera.setParameters(parameter);}break;default:break;}}}

最后在AndroidManifest.xml中添加相应的权限：

<uses-permission android:name="android.permission.FLASHLIGHT" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.autofocus" />

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