转载出处:http://www.blog.youkuaiyun.com/tangcheng_ok
由于要做说明书,或者给客户看效果图,不得不通过截图的方式把屏幕接下来(当然了,还可以通过拍照来达到目的)。于是就Google找到一些需要Root权限,和不需要Root权限的截图应用,有些失望,多数不可用。于是就想自己开发一个截图的应用。在View 中提供一个getDrawingCache的方法,可以通过次方法获取View的截屏,但仅仅是截取View的。如果要截取状态栏呢?
其实不然,在ICS中的SystemUI就实现了截图的功能,按组合键Power+Volume Add/Volume sub就能截取图片。代码目录:
frameworks/base/packages/SystemUI/src/com/android/systemui/screenshot/在此目录下就两个文件,主要的截图方法在GlobalScreenshot中,本文就通过移植SystemUI中截图的代码实现截图功能。
首先是直接移植SystemUI的代码,实现截图效果,这部分的代码就不贴出来了,直接去下载代码吧, 关键的代码没有几句,最最主要的是:Surface.screenshot(),请看代码吧。
- <span style="font-size:16px;">package org.winplus.ss;
- import java.io.File;
- import java.io.FileNotFoundException;
- import java.io.FileOutputStream;
- import java.io.IOException;
- import java.text.SimpleDateFormat;
- import java.util.Date;
- import android.app.Activity;
- import android.content.Context;
- import android.graphics.Bitmap;
- import android.graphics.Canvas;
- import android.graphics.Matrix;
- import android.os.Bundle;
- import android.util.DisplayMetrics;
- import android.util.Log;
- import android.view.Display;
- import android.view.Surface;
- import android.view.WindowManager;
- import android.os.SystemProperties;
- public class SimpleScreenshotActivity extends Activity {
- private Display mDisplay;
- private WindowManager mWindowManager;
- private DisplayMetrics mDisplayMetrics;
- private Bitmap mScreenBitmap;
- private Matrix mDisplayMatrix;
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- new Thread(new Runnable() {
- @Override
- public void run() {
- takeScreenshot();
- }
- }).start();
- }
- private float getDegreesForRotation(int value) {
- switch (value) {
- case Surface.ROTATION_90:
- return 360f - 90f;
- case Surface.ROTATION_180:
- return 360f - 180f;
- case Surface.ROTATION_270:
- return 360f - 270f;
- }
- return 0f;
- }
- private void takeScreenshot() {
- mWindowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
- mDisplay = mWindowManager.getDefaultDisplay();
- mDisplayMetrics = new DisplayMetrics();
- mDisplay.getRealMetrics(mDisplayMetrics);
- mDisplayMatrix = new Matrix();
- float[] dims = { mDisplayMetrics.widthPixels,
- mDisplayMetrics.heightPixels };
- int value = mDisplay.getRotation();
- String hwRotation = SystemProperties.get("ro.sf.hwrotation", "0");
- if (hwRotation.equals("270") || hwRotation.equals("90")) {
- value = (value + 3) % 4;
- }
- float degrees = getDegreesForRotation(value);
- boolean requiresRotation = (degrees > 0);
- if (requiresRotation) {
- // Get the dimensions of the device in its native orientation
- mDisplayMatrix.reset();
- mDisplayMatrix.preRotate(-degrees);
- mDisplayMatrix.mapPoints(dims);
- dims[0] = Math.abs(dims[0]);
- dims[1] = Math.abs(dims[1]);
- }
- mScreenBitmap = Surface.screenshot((int) dims[0], (int) dims[1]);
- if (requiresRotation) {
- // Rotate the screenshot to the current orientation
- Bitmap ss = Bitmap.createBitmap(mDisplayMetrics.widthPixels,
- mDisplayMetrics.heightPixels, Bitmap.Config.ARGB_8888);
- Canvas c = new Canvas(ss);
- c.translate(ss.getWidth() / 2, ss.getHeight() / 2);
- c.rotate(degrees);
- c.translate(-dims[0] / 2, -dims[1] / 2);
- c.drawBitmap(mScreenBitmap, 0, 0, null);
- c.setBitmap(null);
- mScreenBitmap = ss;
- }
- // If we couldn't take the screenshot, notify the user
- if (mScreenBitmap == null) {
- return;
- }
- // Optimizations
- mScreenBitmap.setHasAlpha(false);
- mScreenBitmap.prepareToDraw();
- try {
- saveBitmap(mScreenBitmap);
- } catch (IOException e) {
- System.out.println(e.getMessage());
- }
- }
- public void saveBitmap(Bitmap bitmap) throws IOException {
- String imageDate = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss")
- .format(new Date(System.currentTimeMillis()));
- File file = new File("/mnt/sdcard/Pictures/"+imageDate+".png");
- if(!file.exists()){
- file.createNewFile();
- }
- FileOutputStream out;
- try {
- out = new FileOutputStream(file);
- if (bitmap.compress(Bitmap.CompressFormat.PNG, 70, out)) {
- out.flush();
- out.close();
- }
- } catch (FileNotFoundException e) {
- e.printStackTrace();
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- }
- </span>
PS:1、需要在AndroidManifest.xml中加入代码:android:sharedUserId="android.uid.system"
2、由于调用了@hide的API,所以编译得时候请使用makefile编译。或者通过在Eclipse中添加Jar文件通过编译。
3、此代码只在Android4.0中使用过,2.3的就没去做测试了。