Android View转换成图片保存

桃扇骨 2023-10-16 21:11 17阅读 0赞

package zhangphil.viewtoimage;
    
    import java.io.File;
    import java.io.FileOutputStream;
    
    import android.os.Bundle;
    import android.os.Environment;
    import android.os.Handler;
    import android.view.View;
    import android.widget.Button;
    import android.widget.TextView;
    import android.app.Activity;
    import android.graphics.Bitmap;
    import android.graphics.Canvas;
    import android.graphics.Color;
    import android.graphics.Paint;
    
    /**
     * 把Android的一个View转换成图片保存
     * 
     * */
    
    public class MainActivity extends Activity {
    
    	@Override
    	protected void onCreate(Bundle savedInstanceState) {
    		super.onCreate(savedInstanceState);
    		setContentView(R.layout.activity_main);
    
    		final TextView tv = (TextView) findViewById(R.id.textView);
    		tv.setBackgroundColor(Color.GREEN);
    		// tv.setDrawingCacheEnabled(true);
    
    		final Runnable runnable = new Runnable() {
    			@Override
    			public void run() {
    				viewSaveToImage(tv);
    			}
    		};
    
    		Button button = (Button) findViewById(R.id.button);
    		button.setOnClickListener(new View.OnClickListener() {
    
    			@Override
    			public void onClick(View v) {
    				new Handler().post(runnable);
    			}
    		});
    
    	}
    
    	public void viewSaveToImage(View view) {
    		view.setDrawingCacheEnabled(true);
    		view.setDrawingCacheQuality(View.DRAWING_CACHE_QUALITY_HIGH);
    		view.setDrawingCacheBackgroundColor(Color.WHITE);
    
    		// 把一个View转换成图片
    		Bitmap cachebmp = loadBitmapFromView(view);
    
    		// 添加水印
    		Bitmap bitmap = Bitmap.createBitmap(createWatermarkBitmap(cachebmp,
    				"@ Zhang Phil"));
    
    		FileOutputStream fos;
    		try {
    			// 判断手机设备是否有SD卡
    			boolean isHasSDCard = Environment.getExternalStorageState().equals(
    					android.os.Environment.MEDIA_MOUNTED);
    			if (isHasSDCard) {
    				// SD卡根目录
    				File sdRoot = Environment.getExternalStorageDirectory();
    				File file = new File(sdRoot, "test.PNG");
    				fos = new FileOutputStream(file);
    			} else
    				throw new Exception("创建文件失败!");
    
    			bitmap.compress(Bitmap.CompressFormat.PNG, 90, fos);
    
    			fos.flush();
    			fos.close();
    
    		} catch (Exception e) {
    			e.printStackTrace();
    		}
    
    		view.destroyDrawingCache();
    	}
    
    	private Bitmap loadBitmapFromView(View v) {
    		int w = v.getWidth();
    		int h = v.getHeight();
    
    		Bitmap bmp = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
    		Canvas c = new Canvas(bmp);
    
    		c.drawColor(Color.WHITE);
    		/** 如果不设置canvas画布为白色，则生成透明 */
    
    		v.layout(0, 0, w, h);
    		v.draw(c);
    
    		return bmp;
    	}
    
    	// 为图片target添加水印
    	private Bitmap createWatermarkBitmap(Bitmap target, String str) {
    		int w = target.getWidth();
    		int h = target.getHeight();
    
    		Bitmap bmp = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
    		Canvas canvas = new Canvas(bmp);
    
    		Paint p = new Paint();
    
    		// 水印的颜色
    		p.setColor(Color.RED);
    
    		// 水印的字体大小
    		p.setTextSize(16);
    
    		p.setAntiAlias(true);// 去锯齿
    
    		canvas.drawBitmap(target, 0, 0, p);
    
    		// 在中间位置开始添加水印
    		canvas.drawText(str, w / 2, h / 2, p);
    
    		canvas.save(Canvas.ALL_SAVE_FLAG);
    		canvas.restore();
    
    		return bmp;
    	}
    }