Android View转换成图片保存

1package zhangphil.viewtoimage;
2
3import java.io.File;
4import java.io.FileOutputStream;
5
6import android.os.Bundle;
7import android.os.Environment;
8import android.os.Handler;
9import android.view.View;
10import android.widget.Button;
11import android.widget.TextView;
12import android.app.Activity;
13import android.graphics.Bitmap;
14import android.graphics.Canvas;
15import android.graphics.Color;
16import android.graphics.Paint;
17
18/**
19 * 把Android的一个View转换成图片保存
20 * 
21 * */
22
23public class MainActivity extends Activity {
24
25	@Override
26	protected void onCreate(Bundle savedInstanceState) {
27		super.onCreate(savedInstanceState);
28		setContentView(R.layout.activity_main);
29
30		final TextView tv = (TextView) findViewById(R.id.textView);
31		tv.setBackgroundColor(Color.GREEN);
32		// tv.setDrawingCacheEnabled(true);
33
34		final Runnable runnable = new Runnable() {
35			@Override
36			public void run() {
37				viewSaveToImage(tv);
38			}
39		};
40
41		Button button = (Button) findViewById(R.id.button);
42		button.setOnClickListener(new View.OnClickListener() {
43
44			@Override
45			public void onClick(View v) {
46				new Handler().post(runnable);
47			}
48		});
49
50	}
51
52	public void viewSaveToImage(View view) {
53		view.setDrawingCacheEnabled(true);
54		view.setDrawingCacheQuality(View.DRAWING_CACHE_QUALITY_HIGH);
55		view.setDrawingCacheBackgroundColor(Color.WHITE);
56
57		// 把一个View转换成图片
58		Bitmap cachebmp = loadBitmapFromView(view);
59
60		// 添加水印
61		Bitmap bitmap = Bitmap.createBitmap(createWatermarkBitmap(cachebmp,
62				"@ Zhang Phil"));
63
64		FileOutputStream fos;
65		try {
66			// 判断手机设备是否有SD卡
67			boolean isHasSDCard = Environment.getExternalStorageState().equals(
68					android.os.Environment.MEDIA_MOUNTED);
69			if (isHasSDCard) {
70				// SD卡根目录
71				File sdRoot = Environment.getExternalStorageDirectory();
72				File file = new File(sdRoot, "test.PNG");
73				fos = new FileOutputStream(file);
74			} else
75				throw new Exception("创建文件失败!");
76
77			bitmap.compress(Bitmap.CompressFormat.PNG, 90, fos);
78
79			fos.flush();
80			fos.close();
81
82		} catch (Exception e) {
83			e.printStackTrace();
84		}
85
86		view.destroyDrawingCache();
87	}
88
89	private Bitmap loadBitmapFromView(View v) {
90		int w = v.getWidth();
91		int h = v.getHeight();
92
93		Bitmap bmp = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
94		Canvas c = new Canvas(bmp);
95
96		c.drawColor(Color.WHITE);
97		/** 如果不设置canvas画布为白色，则生成透明 */
98
99		v.layout(0, 0, w, h);
100		v.draw(c);
101
102		return bmp;
103	}
104
105	// 为图片target添加水印
106	private Bitmap createWatermarkBitmap(Bitmap target, String str) {
107		int w = target.getWidth();
108		int h = target.getHeight();
109
110		Bitmap bmp = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
111		Canvas canvas = new Canvas(bmp);
112
113		Paint p = new Paint();
114
115		// 水印的颜色
116		p.setColor(Color.RED);
117
118		// 水印的字体大小
119		p.setTextSize(16);
120
121		p.setAntiAlias(true);// 去锯齿
122
123		canvas.drawBitmap(target, 0, 0, p);
124
125		// 在中间位置开始添加水印
126		canvas.drawText(str, w / 2, h / 2, p);
127
128		canvas.save(Canvas.ALL_SAVE_FLAG);
129		canvas.restore();
130
131		return bmp;
132	}
133}