Android之实现手电筒实例

  主要实现两个步骤：

       1、实现打开和关闭闪光灯；而实现操作闪光灯主要通过Camera类

             Camera camera = Camera.open();
	      Parameters mParameters = camera.getParameters();
	      mParameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);//打开Camera.Parameters.FLASH_MODE_OFF则为关闭
	     camera.setParameters(mParameters)

        2、自定义闪光灯的按钮；自定义控件主要是设置设置view的大小

 onMeasure(int widthMeasureSpec, int heightMeasureSpec) 

这个方法介绍 http://blog.csdn.net/x605940745/article/details/17583609

效果如下：

源码如下：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:background="@drawable/light"
    tools:context=".MainActivity" >


   <com.android.xiong.xionglight.LightBkView 
        android:id="@+id/light1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

</RelativeLayout>

<uses-permission android:name="android.permission.CAMERA" />

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;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		light1 = (LightBkView) findViewById(R.id.light1);
		//定义单击事件
		light1.setOnClickListener(light1);
		
	}

	@Override
	public 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();
	// 定义画皮
	Paint paint = new Paint();
	Paint paint1 = new Paint();
	int x = 0;
	int y = 0;
	// 打开闪光灯
	boolean islight;

	public LightBkView(Context context, AttributeSet set) {
		super(context, set);
	}

	@Override
	protected void onDraw(Canvas canvas) {
		// 获取控件的宽度和高度
		int width = this.getWidth();
		int heigth = this.getHeight();
		// 圆点的坐标
		x = width / 2;
		y = heigth / 2;
		//更换开关背景
		if(!islight){
		paint.setColor(Color.BLUE);
		canvas.drawCircle(x, y, 60, paint);
		paint1.setColor(Color.RED);
		paint1.setTextSize(20);
		canvas.drawText("打开闪光灯", 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("关闭闪光灯", x-50, y, paint1);
			invalidate();
		}
	}

	// 定义View的大小
	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
		setMeasuredDimension(getWidth(widthMeasureSpec),
				getHeight(heightMeasureSpec));

	}
	//定义view的宽度
	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;
	}
	//定义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;
	}

	// 实现闪光灯的的开关
	@Override
	public 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;
		}
	}

}

转载请注明出处： http://blog.csdn.net/x605940745
源码下载: http://download.csdn.net/detail/x605940745/6772637