AndroidStudio实现截屏（2023年最新版）

流程是：当点击界面上的按钮时，对当前屏幕进行全屏截图，截图保存到系统相册中。

布局代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".ScreenShotActivity">

    <Button
        android:id="@+id/screenBtn"
        android:text="截屏ScreenShotActivity"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
</LinearLayout>

java代码：

package com.application.screenshot;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import android.Manifest;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

public class ScreenShotActivity extends AppCompatActivity {

    private Button screen_shot;
    private static final int REQUEST_CODE_PERMISSION=100;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_screen_shot);
        screen_shot=findViewById(R.id.screenBtn);
        screen_shot.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (hasWritePermission()) {
                    captureScreenshot();
                }else {
                    requestPermission();
                }
            }
        });
    }
    private boolean hasWritePermission(){
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
            return ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)== PackageManager.PERMISSION_GRANTED;
        }
        return true;
    }
    private void requestPermission(){
        ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},REQUEST_CODE_PERMISSION);
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == REQUEST_CODE_PERMISSION) {
            if (grantResults.length > 0 && grantResults[0]==PackageManager.PERMISSION_GRANTED) {
                captureScreenshot();
            }else {
                Toast.makeText(this, "Permission denied!", Toast.LENGTH_SHORT).show();
            }
        }
    }
    private void captureScreenshot(){
        View rootView = getWindow().getDecorView().getRootView();
        Bitmap screenshot =Bitmap.createBitmap(rootView.getWidth(),rootView.getHeight(),Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(screenshot);
        rootView.draw(canvas);
        try {
            String fileName = "screenshot_" + System.currentTimeMillis();
            File file = new File(getExternalFilesDir(null), fileName + ".jpg");

            FileOutputStream fos = new FileOutputStream(file);
            screenshot.compress(Bitmap.CompressFormat.JPEG, 100, fos);

            fos.flush();
            fos.close();

            //将截图添加到系统相册
            MediaStore.Images.Media.insertImage(getContentResolver(),file.getAbsolutePath(),file.getName(),null);
            Toast.makeText(this, "截图保存成功！", Toast.LENGTH_SHORT).show();
        }catch (IOException e){
            e.printStackTrace();
        }
    }
}

运行结果如下：

有任何问题，可评论区滴滴我。

【拓展：若当前界面有密码等隐私存在时，无法启动截屏，或者点击系统截屏按钮时，截下来的图片是一张黑色图片，从而形成一种保护。截图均保存到系统系统相册中。

大家对这个问题有见解或兴趣的，都可以一起讨论。】