截取手機屏幕成圖片保存到sdcard卡當中

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.os.Bundle;
import android.os.Environment;
import android.view.Display;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.Toast;

public class PrintScreenDemoActivity extends Activity {
private Button mButton;
private LinearLayout mLayout;
private int mPrintNum;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
LayoutInflater inf = this.getLayoutInflater();
mLayout = (LinearLayout)inf.inflate(R.layout.main, null);
setContentView(mLayout);
mButton = (Button)findViewById(R.id.print_btn);
mButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
GetandSaveCurrentImage();
mPrintNum++;
mButton.setText("截屏次數:"+mPrintNum);
}
});
}
private void GetandSaveCurrentImage()
{
//1.構建Bitmap
WindowManager windowManager = getWindowManager();
Display display = windowManager.getDefaultDisplay();
int w = display.getWidth();
int h = display.getHeight();

Bitmap Bmp = Bitmap.createBitmap( w, h, Config.ARGB_8888 );

//2.獲取屏幕
View decorview = this.getWindow().getDecorView();
decorview.setDrawingCacheEnabled(true);
Bmp = decorview.getDrawingCache();
String SavePath = getSDCardPath()+"/PrintScreenDemo/ScreenImage";

//3.保存Bitmap
try {
File path = new File(SavePath);
//文件
String filepath = SavePath + "/Screen_"+mPrintNum+".png";
File file = new File(filepath);
if(!path.exists()){
path.mkdirs();
}
if (!file.exists()) {
file.createNewFile();
}

FileOutputStream fos = null;
fos = new FileOutputStream(file);
if (null != fos) {
Bmp.compress(Bitmap.CompressFormat.PNG, 90, fos);
fos.flush();
fos.close();

Toast.makeText(this, "截屏文件已保存至SDCard/PrintScreenDemo/ScreenImage/下", Toast.LENGTH_LONG).show();
}

} catch (Exception e) {
e.printStackTrace();
}
}

/**
* 獲取SDCard的目錄路徑功能
* @return
*/
private String getSDCardPath(){
File sdcardDir = null;
//判斷SDCard是否存在
boolean sdcardExist = Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED);
if(sdcardExist){
sdcardDir = Environment.getExternalStorageDirectory();
}

return sdcardDir.toString();
}
}

佈局文件:
< ?xml version="1.0" encoding="utf-8"?>
< LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<Button
android:id="@+id/print_btn"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="截屏" />

</LinearLayout>
因爲是把截屏的圖片存放到sd卡里,因此要在manifest.xml文件中增長對sd卡的寫入權限.