自己编写Android手电筒,支持5.0

android手电筒原理很简单，就是打开相机的闪光灯。

核心的代码就这么多：

打开相机

设置闪光灯开

打开预览

设置相机的autoFocus

  Camera camera = Camera.open();  Parameters mParameters = camera.getParameters();  mParameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);   camera.setParameters(mParameters);  camera.startPreview();  camera.autoFocus(new AutoFocusCallback() {public void onAutoFocus(boolean success, Camera camera) {}  });

这几个步骤缺一不可。照网上之前的例子试了，一直不成功。就是因为有些缺了打开预览，有些缺了autoFocus

然后就是设置权限

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

最后贴以下完整的Activity。我这个很简单，create的时候就打开手电筒，屏幕上显示”Flashlight open“，按返回键，关闭并退出应用。

package org.lhc.flashlight;import android.app.Activity;import android.hardware.Camera;import android.hardware.Camera.AutoFocusCallback;import android.hardware.Camera.Parameters;import android.os.Bundle;import android.util.Log;import android.view.KeyEvent;import android.widget.TextView;public class MainActivity extends Activity {private Camera camera = null;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);this.camera = Camera.open();if (this.camera != null) {Parameters mParameters = camera.getParameters();mParameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH); camera.setParameters(mParameters);camera.startPreview();camera.autoFocus(new AutoFocusCallback() {public void onAutoFocus(boolean success, Camera camera) {}});TextView info = (TextView)this.findViewById(R.id.flashlight_info);info.setText("Flashlight open");}}@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {if (keyCode == KeyEvent.KEYCODE_BACK) {if (this.camera != null) {Parameters mParameters = camera.getParameters();mParameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);camera.setParameters(mParameters);camera.stopPreview();camera.release();}Log.i("Flashlight", "exit");this.finish();System.exit(0);}return super.onKeyDown(keyCode, event);}}

全部代码：http://download.csdn.net/detail/redstarofsleep/8749589

转载请注明出处

http://blog.csdn.net/redstarofsleep/article/details/4539068

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