如何在Android中以编程方式获取屏幕截图？

在每部Android手机中，我们都有拍摄屏幕截图的功能。在本文中，我们将解释如何以编程方式拍摄屏幕截图。下面给出了一个示例GIF，以了解我们将在本文中做些什么。注意，我们将使用Java语言实现该项目。

分步实施

步骤1：创建一个新项目

要在Android Studio中创建新项目，请参阅如何在Android Studio中创建/启动新项目。请注意，选择Java作为编程语言。

步骤2：向AndroidManifest.xml文件添加权限

将以下权限添加到AndroidManifest.xml文件

步骤3：使用activity_main.xml文件

导航到应用程序> res>布局> activity_main.xml，然后将以下代码添加到该文件中。以下是activity_main.xml文件的代码。

步骤4：将音频文件添加到Raw文件夹

请参考Android Studio中的Resource Raw文件夹，然后将音频文件添加到Raw文件夹。

步骤5：使用MainActivity。 Java文件

转到MainActivity。 Java文件并参考以下代码。下面是MainActivity的代码。 Java文件。在代码内部添加了注释，以更详细地了解代码。

Java

import android.Manifest;
import android.app.Activity;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
  
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
  
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Date;
  
public class MainActivity extends AppCompatActivity {
  
    Button click;
    private static final int REQUEST_EXTERNAL_STORAGe = 1;
    private static String[] permissionstorage = {Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE};
  
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        click = findViewById(R.id.clickme);
        verifystoragepermissions(this);
          
        // adding beep sound
        final MediaPlayer mediaPlayer = MediaPlayer.create(this, R.raw.beep);
        click.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(MainActivity.this, "You just Captured a Screenshot," +
                        " Open Gallery/ File Storage to view your captured Screenshot", Toast.LENGTH_SHORT).show();
                screenshot(getWindow().getDecorView().getRootView(), "result");
  
                mediaPlayer.start();
            }
        });
    }
  
    protected static File screenshot(View view, String filename) {
        Date date = new Date();
          
        // Here we are initialising the format of our image name
        CharSequence format = android.text.format.DateFormat.format("yyyy-MM-dd_hh:mm:ss", date);
        try {
            // Initialising the directory of storage
            String dirpath = Environment.getExternalStorageDirectory() + "";
            File file = new File(dirpath);
            if (!file.exists()) {
                boolean mkdir = file.mkdir();
            }
              
            // File name
            String path = dirpath + "/" + filename + "-" + format + ".jpeg";
            view.setDrawingCacheEnabled(true);
            Bitmap bitmap = Bitmap.createBitmap(view.getDrawingCache());
            view.setDrawingCacheEnabled(false);
            File imageurl = new File(path);
            FileOutputStream outputStream = new FileOutputStream(imageurl);
            bitmap.compress(Bitmap.CompressFormat.JPEG, 50, outputStream);
            outputStream.flush();
            outputStream.close();
            return imageurl;
  
        } catch (FileNotFoundException io) {
            io.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
  
    // verifying if storage permission is given or not
    public static void verifystoragepermissions(Activity activity) {
          
        int permissions = ActivityCompat.checkSelfPermission(activity, Manifest.permission.WRITE_EXTERNAL_STORAGE);
          
        // If storage permission is not given then request for External Storage Permission
        if (permissions != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(activity, permissionstorage, REQUEST_EXTERNAL_STORAGe);
        }
    }
}

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