Android實現截取當前屏幕圖像並保存至SDCard特定目錄下

第一步：main.xml 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#FFFFFFFF"
    android:orientation="vertical"
    >

    <Button
        android:id="@+id/button01"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="截取當前屏幕"
        />
    
    <TextView
        android:id="@+id/textview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="100.0dip"
        android:text="這是當前屏幕"
        android:textSize="20.0sp"
        android:textColor="#FFFF0000"
        android:gravity="center"
        android:layout_gravity="center_horizontal"
        />

</LinearLayout>

第二步：MainActivity.java

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.widget.Button;
import android.view.Display;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;

public class MainActivity extends Activity 
{
    private Button button01;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.main);
        
        initView();
        
        button01.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v)
            {
                button01.setVisibility(Button.GONE);//如果在截圖的時候不想顯示該按鈕,則可以在截圖開始時隱藏按鈕
                getAndSaveCurrentImage();
                button01.setVisibility(Button.VISIBLE);//截圖結束時顯示按鈕
            }
        });
    }
    
    //初始化組件
    public void initView()
    {
        button01 = (Button)this.findViewById(R.id.button01);
    }
    
    //截取當前屏幕的圖像並保存至SDCard特定目錄下
    public void getAndSaveCurrentImage()
    {
        WindowManager windowManager = this.getWindowManager();
        Display display = windowManager.getDefaultDisplay();
        int w = display.getWidth();
        int h = display.getHeight();
        Bitmap bitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
        View decorView = this.getWindow().getDecorView();
        decorView.setDrawingCacheEnabled(true);
        bitmap = decorView.getDrawingCache();
        String savePath = getSDCardPath() + "/mcc/currentImage";
        try
        {
            File path = new File(savePath);
            String filePath = savePath + "/mcc.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)
            {
                bitmap.compress(Bitmap.CompressFormat.PNG, 90, fos);
                fos.flush();
                fos.close();
            }
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
    }
    
    //得到SDCard根目錄
    public String getSDCardPath()
    {
        File sdCardDir = null;
        if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))
        {
            sdCardDir = Environment.getExternalStorageDirectory();
        }
        return sdCardDir.toString();
    }

}

第三步：在AndroidMainfest.xml文件中配置如下權限
             <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />