Android之實現手電筒執行個體

主要實現兩個步驟：

1、實現開啟和關閉閃光燈；而實現操作閃光燈主要通過Camera類

 

             Camera camera = Camera.open();      Parameters mParameters = camera.getParameters();      mParameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);//開啟Camera.Parameters.FLASH_MODE_OFF則為關閉     camera.setParameters(mParameters)

 

2、自訂閃光燈的按鈕；自訂控制項主要是設定設定view的大小

 

 onMeasure(int widthMeasureSpec, int heightMeasureSpec) 

這個方法介紹http://blog.csdn.net/x605940745/article/details/17583609

 

效果如下：

源碼如下：

 

package com.android.xiong.xionglight;import android.app.Activity;import android.os.Bundle;import android.view.KeyEvent;import android.view.Menu;public class MainActivity extends Activity {private LightBkView light1;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);light1 = (LightBkView) findViewById(R.id.light1);//定義單擊事件light1.setOnClickListener(light1);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {getMenuInflater().inflate(R.menu.main, menu);return true;}}

package com.android.xiong.xionglight;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.hardware.Camera;import android.hardware.Camera.Parameters;import android.util.AttributeSet;import android.view.View;import android.view.View.OnClickListener;public class LightBkView extends View implements OnClickListener {Camera camera = Camera.open();// 定義畫皮Paint paint = new Paint();Paint paint1 = new Paint();int x = 0;int y = 0;// 開啟閃光燈boolean islight;public LightBkView(Context context, AttributeSet set) {super(context, set);}@Overrideprotected void onDraw(Canvas canvas) {// 擷取控制項的寬度和高度int width = this.getWidth();int heigth = this.getHeight();// 圓點的座標x = width / 2;y = heigth / 2;//更換開關背景if(!islight){paint.setColor(Color.BLUE);canvas.drawCircle(x, y, 60, paint);paint1.setColor(Color.RED);paint1.setTextSize(20);canvas.drawText(開啟閃光燈, x-50, y, paint1);invalidate();}else{paint.setColor(Color.WHITE);canvas.drawCircle(x, y, 60, paint);paint1.setColor(Color.RED);paint1.setTextSize(20);canvas.drawText(關閉閃光燈, x-50, y, paint1);invalidate();}}// 定義View的大小@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {setMeasuredDimension(getWidth(widthMeasureSpec),getHeight(heightMeasureSpec));}//定義view的寬度public int getWidth(int widthMeasureSpec) {int reslut = 0;int widthMode = MeasureSpec.getMode(widthMeasureSpec);if (widthMode == MeasureSpec.AT_MOST) {reslut = 120;}if (widthMode == MeasureSpec.EXACTLY) {reslut = MeasureSpec.getSize(widthMeasureSpec);}return reslut;}//定義view的高度public int getHeight(int heightMeasureSpec) {int reslut = 0;int heightMode = MeasureSpec.getMode(heightMeasureSpec);if (heightMode == MeasureSpec.AT_MOST) {reslut = 120;}if (heightMode == MeasureSpec.EXACTLY) {reslut = MeasureSpec.getSize(heightMeasureSpec);}return reslut;}// 實現閃光燈的的開關@Overridepublic void onClick(View v) {if (!islight) {Parameters mParameters = camera.getParameters();mParameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);camera.setParameters(mParameters);islight = true;} else {Parameters mParameters = camera.getParameters();mParameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);camera.setParameters(mParameters);islight = false;}}}