Android截图以及加水印Demo

最新推荐文章于 2025-05-22 14:58:26 发布

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本文介绍了一个简单的Android应用，该应用能够实现截图功能，并能在截图上添加包含当前时间的水印。

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实现一个简单的截图功能以及给图片添加水印的功能，直接上代码！

一、代码实现

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import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Typeface;
import android.graphics.Bitmap.Config;
import android.os.Bundle;
import android.text.format.Time;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
public class GetAppThumbnailActivity extends Activity {
private Button btnThum;
private ImageView imgThum;
private ImageView imgSource;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setupViews();
}
private void setupViews() {
btnThum = (Button) findViewById(R.id.getThum);
imgThum = (ImageView) findViewById(R.id.setThum);
imgSource = (ImageView) findViewById(R.id.source);
btnThum.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Bitmap bitmap = getViewBitmap(imgSource);
Bitmap bitmap1 = createBitmap(bitmap, "haha哈哈");
if (bitmap1 != null) {
imgThum.setImageBitmap(bitmap1);
}
}
});
}
/**
* Draw the view into a bitmap.
*/
private Bitmap getViewBitmap(View v) {
v.clearFocus();
v.setPressed(false);
boolean willNotCache = v.willNotCacheDrawing();
v.setWillNotCacheDrawing(false);
// Reset the drawing cache background color to fully transparent
// for the duration of this operation
int color = v.getDrawingCacheBackgroundColor();
v.setDrawingCacheBackgroundColor(0);
if (color != 0) {
v.destroyDrawingCache();
}
v.buildDrawingCache();
Bitmap cacheBitmap = v.getDrawingCache();
if (cacheBitmap == null) {
return null;
}
Bitmap bitmap = Bitmap.createBitmap(cacheBitmap);
// Restore the view
v.destroyDrawingCache();
v.setWillNotCacheDrawing(willNotCache);
v.setDrawingCacheBackgroundColor(color);
return bitmap;
}
// 给图片添加水印
private Bitmap createBitmap(Bitmap src, String str) {
Time t = new Time();
t.setToNow();
int w = src.getWidth();
int h = src.getHeight();
String mstrTitle = "截图时间："+t.hour + ":" + t.minute + ":" + t.second;
Bitmap bmpTemp = Bitmap.createBitmap(w, h, Config.ARGB_8888);
Canvas canvas = new Canvas(bmpTemp);
Paint p = new Paint();
String familyName = "宋体";
Typeface font = Typeface.create(familyName, Typeface.BOLD);
p.setColor(Color.BLUE);
p.setTypeface(font);
p.setTextSize(22);
canvas.drawBitmap(src, 0, 0, p);
canvas.drawText(mstrTitle, 0, 20, p);
canvas.save(Canvas.ALL_SAVE_FLAG);
canvas.restore();
return bmpTemp;
}
}

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Typeface;
import android.graphics.Bitmap.Config;
import android.os.Bundle;
import android.text.format.Time;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

public class GetAppThumbnailActivity extends Activity {
	private Button btnThum;
	private ImageView imgThum;
	private ImageView imgSource;

@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		setupViews();
	}

private void setupViews() {
		btnThum = (Button) findViewById(R.id.getThum);
		imgThum = (ImageView) findViewById(R.id.setThum);
		imgSource = (ImageView) findViewById(R.id.source);

btnThum.setOnClickListener(new OnClickListener() {

@Override
			public void onClick(View v) {
				Bitmap bitmap = getViewBitmap(imgSource);
				Bitmap bitmap1 = createBitmap(bitmap, "haha哈哈");
				if (bitmap1 != null) {
					imgThum.setImageBitmap(bitmap1);
				}
			}
		});
	}

/**
	 * Draw the view into a bitmap.
	 */
	private Bitmap getViewBitmap(View v) {
		v.clearFocus();
		v.setPressed(false);

boolean willNotCache = v.willNotCacheDrawing();
		v.setWillNotCacheDrawing(false);

// Reset the drawing cache background color to fully transparent
		// for the duration of this operation
		int color = v.getDrawingCacheBackgroundColor();
		v.setDrawingCacheBackgroundColor(0);

if (color != 0) {
			v.destroyDrawingCache();
		}
		v.buildDrawingCache();
		Bitmap cacheBitmap = v.getDrawingCache();
		if (cacheBitmap == null) {
			return null;
		}

Bitmap bitmap = Bitmap.createBitmap(cacheBitmap);

// Restore the view
		v.destroyDrawingCache();
		v.setWillNotCacheDrawing(willNotCache);
		v.setDrawingCacheBackgroundColor(color);

return bitmap;
	}

// 给图片添加水印
	private Bitmap createBitmap(Bitmap src, String str) {
		Time t = new Time();
		t.setToNow(); 
		int w = src.getWidth();
		int h = src.getHeight();
		String mstrTitle = "截图时间："+t.hour + ":" + t.minute + ":" + t.second;
		Bitmap bmpTemp = Bitmap.createBitmap(w, h, Config.ARGB_8888);
		Canvas canvas = new Canvas(bmpTemp);
		Paint p = new Paint();
		String familyName = "宋体";
		Typeface font = Typeface.create(familyName, Typeface.BOLD);
		p.setColor(Color.BLUE);
		p.setTypeface(font);
		p.setTextSize(22);
		canvas.drawBitmap(src, 0, 0, p);
		canvas.drawText(mstrTitle, 0, 20, p);
		canvas.save(Canvas.ALL_SAVE_FLAG);
		canvas.restore();
		return bmpTemp;
	}

}