使用照相机开启闪光灯

package com.home.light;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;import com.home.cameralight.R;public class TestActivity extends Activity implements OnClickListener {Camera camera;Parameters params;private Button onBtn;private Button offBtn;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);camera = Camera.open();params = camera.getParameters();findView();}private void findView() {onBtn = (Button) findViewById(R.id.main_btn_on);onBtn.setOnClickListener(this);offBtn = (Button) findViewById(R.id.main_btn_off);offBtn.setOnClickListener(this);}@Overridepublic void onClick(View v) {if (v == onBtn) {//open1();open2();} else if (v == offBtn) {//off1();off2();}}private void open1() {if (camera == null) {camera = Camera.open();params = camera.getParameters();}params.setFlashMode(Parameters.FLASH_MODE_TORCH);camera.setParameters(params);}private void off1() {if (camera == null) {return;}params.setFlashMode(Parameters.FLASH_MODE_OFF);camera.setParameters(params);camera.release();camera = null;}private void open2() {if (camera == null) {camera = Camera.open();params = camera.getParameters();}params.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);camera.setParameters(params);camera.autoFocus(new Camera.AutoFocusCallback() {public void onAutoFocus(boolean success, Camera camera) {}});camera.startPreview();}private void off2() {if (camera == null) {return;}camera.stopPreview();camera.release();camera = null;}}

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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