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

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;

}

}

2、资源描述文件

android:orientation="vertical" android:layout_width="fill_parent"

android:layout_height="fill_parent">

android:id="@+id/getThum"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="@string/str_getthum"/>

android:id="@+id/setThum"

android:background="@drawable/no_image"

android:layout_width="wrap_content"

android:layout_height="wrap_content"/>

android:id="@+id/source"

android:background="@drawable/v"

android:layout_width="wrap_content"

android:layout_height="wrap_content"/>

4、效果演示