为什么我的android studio应用程序未在android 10中运行并且无法在android 10以外的所有android版本中成功运行？

问题描述

请告诉我要实现的更改，以便我的应用也可以在android 10 API 29中成功运行。 这个应用程式可以在android 10以外的所有android装置上成功执行。 但是，我还添加了外部存储权限，以检索设备的音频文件并将其显示在我的AI音乐播放器的列表视图中。

我的MainActivity代码是

  package rishabh.example.aimusicplayer;

import androidx.appcompat.app.AppCompatActivity;

import android.Manifest;
import android.os.Bundle;
import android.os.Environment;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

import com.karumi.dexter.Dexter;
import com.karumi.dexter.PermissionToken;
import com.karumi.dexter.listener.PermissionDeniedResponse;
import com.karumi.dexter.listener.PermissionGrantedResponse;
import com.karumi.dexter.listener.PermissionRequest;
import com.karumi.dexter.listener.single.PermissionListener;

import java.io.File;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity
{
    private String[] itemsAll;
    private ListView mSongsList;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mSongsList = findViewById(R.id.songsList);

        appExternalStoragePermission();
    }

    public void appExternalStoragePermission()
    {
        Dexter.withContext(this)
                .withPermission(Manifest.permission.READ_EXTERNAL_STORAGE)
                .withListener(new PermissionListener() {
                    @Override
                    public void onPermissionGranted(PermissionGrantedResponse response)
                    {
                        displayAudioSongsName();
                    }

                    @Override
                    public void onPermissionDenied(PermissionDeniedResponse response)
                    {

                    }

                    @Override
                    public void onPermissionRationaleShouldBeShown(PermissionRequest permssion,PermissionToken token)
                    {
                        token.continuePermissionRequest();
                    }
                }).check();
    }

    public ArrayList<File> readOnlyAudioSongs(File file) {
        ArrayList<File> arrayList = new ArrayList<>();

        File[] allFiles = file.listFiles();
        if (null != file && null != file.listFiles())
        {
            for (File individualFile : allFiles)
            {
                if (individualFile.isDirectory() && !individualFile.isHidden())
                {
                    arrayList.addAll(readOnlyAudioSongs(individualFile));
                }
                else
                {
                    if (individualFile.getName().endsWith(".mp3") || individualFile.getName().endsWith(".aac") || individualFile.getName().endsWith(".wav") || individualFile.getName().endsWith(".wma"))
                    {
                        arrayList.add(individualFile);
                    }
                }
            }
        }

        return arrayList;
    }

    private void displayAudioSongsName()
    {
        final ArrayList<File> audioSongs = readOnlyAudioSongs(Environment.getExternalStorageDirectory());

        itemsAll = new String[audioSongs.size()];

        for (int songCounter = 0; songCounter<audioSongs.size(); songCounter++)
        {
            itemsAll[songCounter] = audioSongs.get(songCounter).getName();
        }

        ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_list_item_1,itemsAll);
        mSongsList.setAdapter(arrayAdapter);
    }
}

我的构建gradle代码是

apply plugin: 'com.android.application'

android {
    compileSdkVersion 30
    buildToolsversion "30.0.2"

    defaultConfig {
        applicationId "rishabh.example.aimusicplayer"
        minSdkVersion 19
        targetSdkVersion 30
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'),'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation filetree(dir: "libs",include: ["*.jar"])
    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.1'
    implementation 'com.karumi:dexter:6.2.1'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'

}

我的Android清单代码为

    <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="rishabh.example.aimusicplayer">

    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.RECORD_AUdio" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        android:grantUriPermissions="true"
        android:requestLegacyExternalStorage="true"
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".SmartPlayerActivity">
        </activity>
    </application>

</manifest>

解决方法

如果您使用的是android 10或更高版本，请不要忘记在清单中添加

android:grantUriPermissions="true"
android:requestLegacyExternalStorage="true"

,

在应用程序内部的清单中添加 android:requestLegacyExternalStorage="true"