最近项目APP需要在线升级功能，网上也有一些例子，但是在新版上9.0，10.0，11.0上不工作，没办法，一通找资料摸索，临时作了一个小Demo，终于在最新Android版本上验证OK，直接上代码，不耍流氓，需要的自取，喜欢的打赏，谢谢。
源码如下：
（1）AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.michaelsoftware.installapksample">
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
<uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES"></uses-permission>
<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/Theme.InstallAPKSample">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<!--android:authorities="${applicationId}.provider" -->
<provider
android:name="androidx.core.content.FileProvider"
android:authorities="com.michaelsoftware.onlineclock.FileProvider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_paths" />
</provider>
</application>
</manifest>
（2）升级APK文件路径配置文件 res/xml/file_paths.xml
<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<!--
//每个节点都支持两个属性：name+path
//path：需要临时授权访问的路径（.代表所有路径）
//name：就是你给这个访问路径起个名字-->
<external-path
name="external"
path="Android/data/com.michaelsoftware.onlineclock" />
<external-path
name="external_files"
path="." />
</paths>
（3）布局很简单，就作了一个Textview，资源和样式全缺省的，布局activity_main.xml如下：
<?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:gravity="center"
tools:context=".MainActivity">
<TextView
android:id="@+id/InstallAPK"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:textSize="20sp"
android:text="Install APK"/>
</LinearLayout>
(4) 最核心的部分，MainActivity.java
package com.michaelsoftware.installapksample;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.core.content.FileProvider;
import android.Manifest;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.ComponentName;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.provider.Settings;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import java.io.File;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class MainActivity extends AppCompatActivity
{
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView textView = findViewById(R.id.InstallAPK);
//Storage Permission
if (Build.VERSION.SDK_INT >= 23)
{
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
{
if (!getPackageManager().canRequestPackageInstalls())
{
startActivityForResult(new Intent(Settings.ACTION_MANAGE_UNKNOWN_APP_SOURCES).setData(Uri.parse(String.format("package:%s", getPackageName()))), 110);
}
}
if (ContextCompat.checkSelfPermission(MainActivity.this,
Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this,
new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 111);
}
if (ContextCompat.checkSelfPermission(MainActivity.this,
Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this,
new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 112);
}
}
textView.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View view)
{
finish();
InstallAPK();
}
});
}
private void InstallAPK()
{
String directory = Environment.getExternalStorageDirectory() + "/Download/" + "OnlineClock-1.0.9.apk";
File apkFile = new File(directory);
if (apkFile.exists())
{
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N)
{
Uri uri = FileProvider.getUriForFile(MainActivity.this, "com.michaelsoftware.onlineclock.FileProvider", apkFile);
intent.setDataAndType(uri, "application/vnd.android.package-archive");
}
else
{
intent.setDataAndType(Uri.fromFile(apkFile),"application/vnd.android.package-archive");
}
startActivity(intent);
}
else
{
Toast.makeText(MainActivity.this, "安装文件不存在", Toast.LENGTH_LONG).show();
}
}
}
这个例子是在下载完成后，执行安装，所以安装路径在download目录下，可以根据自己需要任意修改。
完工。
