[Android 笔记四 ] 使用MediaProvider找到系统中的图片文件_android使用mediastory获取相片-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_38423311/article/details/108203676

这篇博客详细介绍了如何在Android应用中使用MediaProvider来查找并访问系统中的图片文件，包括布局设置、字符串资源、配置文件的配置，并展示了实现后的效果，确保在模拟器中有可用的照片。

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1.MainActivity

package com.example.mymediaprovider;

import android.Manifest;
import android.app.AlertDialog;
import android.content.ContentResolver;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.provider.MediaStore;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.Toast;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import static android.content.pm.PackageManager.PERMISSION_GRANTED;
import static android.provider.Settings.ACTION_APPLICATION_DETAILS_SETTINGS;

public class MainActivity extends AppCompatActivity {
    private ContentResolver mProvider;
    //Don't ask again
    private static final int NOT_ASK_AGAIN = 2;
    private AlertDialog mDialog;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        myRequestPermission();
    }
    //get user permission
    private void myRequestPermission() {
        if (ContextCompat.checkSelfPermission(this,
                Manifest.permission.WRITE_EXTERNAL_STORAGE) != PERMISSION_GRANTED)
            ActivityCompat.requestPermissions(this,
                    new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
                    1);
        else {
            run();
            Toast.makeText(this, R.string.toast_alreadyPermiss, Toast.LENGTH_SHORT).show();
        }
    }
    //After having permission, then to get internal data
    private void run() {
        ImageView imageView = findViewById(R.id.iv_imageview);
        String filePath;
        //get data
        mProvider