手电筒

来源：互联网发布：1password 破解 mac 编辑：程序博客网时间：2024/04/29 05:09

Android之实现手电筒实例

2013-12-27 我来说两句来源：剑萧舞蝶的专栏

我要投稿

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

?
1
2
3
4
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

?
1
onMeasure(intwidthMeasureSpec, intheightMeasureSpec)

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

效果如下：

源码如下：

?
1
2
3
4
5
6
<RELATIVELAYOUT xmlns:tools="http://schemas.android.com/tools"xmlns:android="http://schemas.android.com/apk/res/android"tools:context=".MainActivity"android:layout_width="match_parent"android:layout_height="match_parent"android:gravity="center"android:background="@drawable/light">
<COM.ANDROID.XIONG.XIONGLIGHT.LIGHTBKVIEW android:layout_width="wrap_content"android:layout_height="wrap_content/"android:id="@+id/light1">
</COM.ANDROID.XIONG.XIONGLIGHT.LIGHTBKVIEW></RELATIVELAYOUT>

?
1
<USES-PERMISSION android:name="android.permission.CAMERA"></USES-PERMISSION>

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
packagecom.android.xiong.xionglight; 
importandroid.app.Activity; 
importandroid.os.Bundle; 
importandroid.view.KeyEvent; 
importandroid.view.Menu; 
publicclassMainActivity extendsActivity { 
privateLightBkView light1; 
@Override
protectedvoidonCreate(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
publicbooleanonCreateOptionsMenu(Menu menu) { 
getMenuInflater().inflate(R.menu.main, menu);
returntrue;
}
}

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
packagecom.android.xiong.xionglight; 
importandroid.content.Context; 
importandroid.graphics.Canvas; 
importandroid.graphics.Color; 
importandroid.graphics.Paint; 
importandroid.hardware.Camera; 
importandroid.hardware.Camera.Parameters; 
importandroid.util.AttributeSet; 
importandroid.view.View; 
importandroid.view.View.OnClickListener; 
publicclassLightBkView extendsView implementsOnClickListener { 
Camera camera = Camera.open();
// 定义画皮
Paint paint =newPaint(); 
Paint paint1 =newPaint(); 
intx = 0;
inty = 0;
// 打开闪光灯
booleanislight; 
publicLightBkView(Context context, AttributeSet set) { 
super(context, set);
}
@Override
protectedvoidonDraw(Canvas canvas) { 
// 获取控件的宽度和高度
intwidth = this.getWidth();
intheigth = 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
protectedvoidonMeasure(intwidthMeasureSpec, intheightMeasureSpec) { 
setMeasuredDimension(getWidth(widthMeasureSpec),
getHeight(heightMeasureSpec));
}
//定义view的宽度
publicintgetWidth(intwidthMeasureSpec) { 
intreslut = 0;
intwidthMode = MeasureSpec.getMode(widthMeasureSpec); 
if(widthMode == MeasureSpec.AT_MOST) { 
reslut =120;
}
if(widthMode == MeasureSpec.EXACTLY) { 
reslut = MeasureSpec.getSize(widthMeasureSpec);
}
returnreslut; 
}
//定义view的高度
publicintgetHeight(intheightMeasureSpec) { 
intreslut = 0;
intheightMode = MeasureSpec.getMode(heightMeasureSpec); 
if(heightMode == MeasureSpec.AT_MOST) { 
reslut =120;
}
if(heightMode == MeasureSpec.EXACTLY) { 
reslut = MeasureSpec.getSize(heightMeasureSpec);
}
returnreslut; 
}
// 实现闪光灯的的开关
@Override
publicvoidonClick(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;
}
}
}

0 0