[置顶] 安卓手电筒小程序

import android.app.Activity;import android.graphics.Point;import android.graphics.SurfaceTexture;import android.graphics.drawable.TransitionDrawable;import android.hardware.Camera;import android.os.Bundle;import android.view.View;手电筒源码import android.view.ViewGroup;import android.widget.ImageView;public class MainActivity extends Activity{ protected ImageView mImageViewflashlight; protected ImageView mImageViewflashlightcontrol;//热点,点击热点开启闪光灯 protected Camera mCamera; protected Camera.Parameters mParameters; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_light); mImageViewflashlight = (ImageView) findViewById(R.id.image_flashlight); mImageViewflashlightcontrol = (ImageView) findViewById(R.id.image_flashlight_control); Point point = new Point(); getWindowManager().getDefaultDisplay().getSize(point); ViewGroup.LayoutParams layoutParams =mImageViewflashlightcontrol.getLayoutParams(); mImageViewflashlightcontrol.setTag(false); layoutParams.height=point.y*1/6;//设置热点的位置 layoutParams.width=point.x*1/3;// mImageViewflashlightcontrol.setLayoutParams(layoutParams); mImageViewflashlightcontrol.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if(false == (Boolean) mImageViewflashlightcontrol.getTag()) { openLight(); } else if (true == (Boolean) mImageViewflashlightcontrol.getTag()){ closeLight(); } } }); } protected void openLight(){//打开闪光灯的方法 TransitionDrawable drawable = (TransitionDrawable) mImageViewflashlight.getDrawable();//实现两张图片循环的淡入淡出变换的效果 drawable.startTransition(); mImageViewflashlightcontrol.setTag(true); try { mCamera = Camera.open(); mParameters = mCamera.getParameters(); mParameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH); mCamera.setParameters(mParameters); }catch (Exception e) { } } protected void closeLight() {//关闭闪光的方法 TransitionDrawable drawable = (TransitionDrawable) mImageViewflashlight.getDrawable(); //实现淡入淡出效果 if ((Boolean) mImageViewflashlightcontrol.getTag()) { drawable.reverseTransition(); mImageViewflashlightcontrol.setTag(false); if(mCamera!=null) { mParameters = mCamera.getParameters(); mParameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF); mCamera.setParameters(mParameters); mCamera.stopPreview(); mCamera.release(); mCamera = null; } } } @Override protected void onPause() { //当程序暂停后关闭闪光灯 super.onPause(); closeLight(); }

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