<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:tools="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent"  tools:context=".MainActivity" >  <TextView    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_centerHorizontal="true"    android:layout_centerVertical="true"    android:text="@string/hello_world" />    <Button     android:id="@+id/btn_save"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="Screenshot"    /></RelativeLayout>

package com.example.androidtest;import java.io.File;import java.io.FileOutputStream;import android.os.Bundle;import android.os.Environment;import android.app.Activity;import android.graphics.Bitmap;import android.view.Menu;import android.view.View;import android.widget.Button;public class MainActivity extends Activity {  @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main);  Button btn = (Button) this.findViewById(R.id.btn_save); btn.setOnClickListener(new View.OnClickListener() {    @Override  public void onClick(View v) {  screenshot();  } }); }  private void screenshot() { // 獲取屏幕 View dView = getWindow().getDecorView();  dView.setDrawingCacheEnabled(true);   dView.buildDrawingCache();      Bitmap bmp = dView.getDrawingCache();    if (bmp != null)    {     try {     // 獲取內置SD卡路徑     String sdCardPath = Environment.getExternalStorageDirectory().getPath();     // 圖片文件路徑     String filePath = sdCardPath + File.separator + "screenshot.png";          File file = new File(filePath);     FileOutputStream os = new FileOutputStream(file);     bmp.compress(Bitmap.CompressFormat.PNG, 100, os);     os.flush();     os.close();  } catch (Exception e) {  }    } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.activity_main, menu); return true; }}