7.0以上安装APK，请自行配置FileProvider，具体不多说

android:name="androidx.core.content.FileProvider"

android:authorities="${applicationId}.fileprovider"

android:exported="false"

android:grantUriPermissions="true">

android:name="android.support.FILE_PROVIDER_PATHS"

android:resource="@xml/filepaths" />

xml/filepaths.xml如下

name="newApk"

path="newApk0/" /> #我是放在私有目录的files/newApk0下的，请根据自身要求修改

7.0以下安装APK，经常会遇到“安装包找不到”或“解析包失败等原因”，直接上代码了

分析原因：因为我下载的APK是保存在私有目录data/data/{packageName}/files/{自定义文件夹}内的，Android的安装程序在加载安装包的时候，没有访问这个目录的权限，所以要给这个目录修改下访问权限。

public static void install(Context context, File apkFile) {

if (context == null || apkFile == null || !apkFile.exists()) {

return;

}

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {

openInstallPage(context, FileProvider.getUriForFile(context, context.getPackageName() + ".fileprovider", apkFile));

} else {

// 这一步很重要，android 6.0 及以下，需要获取文件全路径的文件权限

chmodFullFile(context, apkFile);

}

}

/**

* 修改file全路径的读写权限

*

* @param file

*/

private static void chmodFullFile(final Context context, final File file) {

if (file == null) {

return;

}

ArrayList commands = new ArrayList<>();

getAllCommand(commands, file);

if (commands.size() > 0) {

String[] c = new String[commands.size()];

for (int i = 0; i < commands.size(); i++) {

c[i] = commands.get(i);

System.out.println(commands.get(i));

}

ProcessUtils.executeProcess(c, null, 5000, new ProcessUtils.ProcessListener() {

@Override

public void finish() {

openInstallPage(context, Uri.fromFile(file));

}

});

}

}

private static void getAllCommand(ArrayList command, File file) {

if (file == null) {

return;

}

command.add("chmod 777 " + file.getAbsolutePath());

getAllCommand(command, file.getParentFile());

}

/**

* 打开apk安装界面

*

* @param context

* @param apkUri

*/

private static void openInstallPage(Context context, Uri apkUri) {

Intent intent = new Intent();

intent.setDataAndType(apkUri, "application/vnd.android.package-archive");

intent.setAction(Intent.ACTION_VIEW);

intent.addCategory("android.intent.category.DEFAULT");

intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);

intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

context.startActivity(intent);

}

ProcessUtils工具类如下：

public class ProcessUtils {

interface ProcessListener {

void finish();

}

/**

* 执行Process命令 cmd

*

* @param command 指令

* @param o

* @param timeout 超时时间

* @param processListener 回调

* @desc 注意：回调没有切换线程

*/

public static void executeProcess(final String[] command, Object o, final long timeout, final ProcessListener processListener) {

new Thread(new Runnable() {

@Override

public void run() {

for (String cmd : command) {

exec(cmd, timeout);

}

processListener.finish();

}

}).start();

}

private static void exec(String command, long timeout) {

Process process = null;

Worker worker = null;

try {

process = Runtime.getRuntime().exec(command);

worker = new Worker(process);

worker.start();

worker.join(timeout);

} catch (InterruptedException | IOException ex) {

if (worker != null) {

worker.interrupt();

}

Thread.currentThread().interrupt();

ex.printStackTrace();

} finally {

if (process != null) {

process.destroy();

}

}

}

private static class Worker extends Thread {

private final Process process;

private Worker(Process process) {

this.process = process;

}

@Override

public void run() {

InputStream errorStream = null;

InputStream inputStream = null;

try {

errorStream = process.getErrorStream();

inputStream = process.getInputStream();

readStreamInfo(errorStream, inputStream);

process.waitFor();

process.destroy();

} catch (InterruptedException ignore) {

}

}

}

/**

* 读取RunTime.exec运行子进程的输入流 和 异常流

*

* @param inputStreams 输入流

*/

private static void readStreamInfo(InputStream... inputStreams) {

ExecutorService executorService = Executors.newFixedThreadPool(inputStreams.length);

for (InputStream in : inputStreams) {

executorService.execute(new CacheConsumer(in));

}

executorService.shutdown();

}

/**

* Process缓存消费者

*/

private static class CacheConsumer implements Runnable {

private InputStream in;

CacheConsumer(InputStream in) {

this.in = in;

}

@Override

public void run() {

try {

BufferedReader br = new BufferedReader(new InputStreamReader(in, "GBK"));

StringBuilder result = new StringBuilder();

String line;

while ((line = br.readLine()) != null) {

result.append(line).append("\n");

}

if (result.length() > 0) {

Log.i("ProcessCacheConsumer", "==> " + result.toString());

}

} catch (IOException e) {

e.printStackTrace();

} finally {

try {

in.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

}

}

相关日志

I/System.out: chmod 777 /data/user/0/com.tencent.tmgp.xxx/files/newApk0/appCode.apk

I/System.out: chmod 777 /data/user/0/com.tencent.tmgp.xxx/files/newApk0

I/System.out: chmod 777 /data/user/0/com.tencent.tmgp.xxx/files

I/System.out: chmod 777 /data/user/0/com.tencent.tmgp.xxx

I/System.out: chmod 777 /data/user/0

I/System.out: chmod 777 /data/user

I/System.out: chmod 777 /data

I/System.out: chmod 777 /

I/ProcessCacheConsumer: ==> chmod: chmod '/data/user/0' to 120777: Permission denied

I/ProcessCacheConsumer: ==> chmod: chmod '/data/user' to 40777: Permission denied

I/ProcessCacheConsumer: ==> chmod: chmod '/data' to 40777: Permission denied

I/ProcessCacheConsumer: ==> chmod: chmod '/' to 40777: Read-only file system