解析清单时的解析错误

Question

我创建了一个应用程序，尝试从远程服务器将APK更新下载到内部存储，然后在设备上安装更新。我在一个API24设备上测试了它，一切都如愿以偿。

现在，我正在API 19设备上测试它(测试代码中与更新应用程序的旧方式有关的部分)，并且我一直得到“解析清单时的分析错误”。令我困惑的是，我可以手动在设备上安装APK，并且没有解析错误，所以我认为问题不存在于实际的清单文件中。我检查了内部存储中下载的APK文件的长度，它似乎完全被下载了。下载APK的代码对于所有API版本都是相同的。

代码：

pathToApk = getFilesDir() + "/update.apk";
try (InputStream is = response.body().byteStream();
     BufferedInputStream input = new BufferedInputStream(is);
     OutputStream os = new FileOutputStream(pathToApk)) {
         byte[] data = new byte[1024];
         int count;
         while ((count = input.read(data)) != -1) {
             os.write(data, 0, count);
         }

}

File toInstall = new File(pathToApk);
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N) {
  Uri apkUri = Uri.fromFile(toInstall);
  Intent intent = new Intent(Intent.ACTION_VIEW);
  intent.setDataAndType(apkUri, "application/vnd.android.package-archive");
  intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
  startActivity(intent);
}

错误：

W/PackageParser: Unable to read AndroidManifest.xml of /data/data/my.package.name/files/update.apk
  java.io.FileNotFoundException: AndroidManifest.xml
    at android.content.res.AssetManager.openXmlAssetNative(Native Method)
    at android.content.res.AssetManager.openXmlBlockAsset(AssetManager.java:501)
    at android.content.res.AssetManager.openXmlResourceParser(AssetManager.java:469)
    at android.content.pm.PackageParser.parsePackage(PackageParser.java:544)
    at com.android.packageinstaller.PackageUtil.getPackageInfo(PackageUtil.java:73)
    at com.android.packageinstaller.PackageInstallerActivity.onCreate(PackageInstallerActivity.java:467)
    at android.app.Activity.performCreate(Activity.java:5350)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1088)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2320)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2417)
    at android.app.ActivityThread.access$800(ActivityThread.java:151)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1342)
    at android.os.Handler.dispatchMessage(Handler.java:110)
    at android.os.Looper.loop(Looper.java:193)
    at android.app.ActivityThread.main(ActivityThread.java:5322)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:829)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:645)
    at dalvik.system.NativeStart.main(Native Method)
11-10 10:16:24.213 4140-4140/? W/PackageInstaller: Parse error when parsing manifest. Discontinuing installation

AndroidManifest.xml:

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

<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.INTERNET" />

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity
        android:name=".main.activities.UpdateActivity"
        android:screenOrientation="portrait">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

    <provider
        android:name="android.support.v4.content.FileProvider"
        android:authorities="${applicationId}.provider"
        android:exported="false"
        android:grantUriPermissions="true">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/provider_paths" />
    </provider>
</application>
</manifest>

编辑

请看我的答案以求解决。

Answer 1

问题是系统无法从我在API<=23上应用程序的私有内部存储读取APK。解决办法很简单。

更改了这一行：

OutputStream os = new FileOutputStream(pathToApk)

对此：

boolean old = Build.VERSION.SDK_INT < Build.VERSION_CODES.N;
OutputStream os = old ? 
    openFileOutput("update.apk", Context.MODE_WORLD_READABLE)
    : new FileOutputStream(pathToApk)

Answer 2

在这里添加请求。

1.checkSelfPermission for Manifest.permission.READ_EXTERNAL_STORAGE

• 如果允许，您可以执行readFile();
• 如果没有，您应该使用requestPermissions。

2.在代码中处理onRequestPermissionsResult

/**
 * permission code
 */
private static final int MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE = 1;

/**
 * requestPermissions and do something
 *
 */
public void requestRead() {
    if (ContextCompat.checkSelfPermission(this,
            Manifest.permission.READ_EXTERNAL_STORAGE)
            != PackageManager.PERMISSION_GRANTED) {

        ActivityCompat.requestPermissions(this,
                new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
                MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE);
    } else {
        readFile();
    }
}

/**
 * do you want to do
 */
public void readFile() {
    // do something
}

/**
 * onRequestPermissionsResult
 *
 * @param requestCode
 * @param permissions
 * @param grantResults
 */
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {

    if (requestCode == MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE) {
        if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            readFile();
        } else {
            // Permission Denied
            Toast.makeText(ToolbarActivity.this, "Permission Denied", Toast.LENGTH_SHORT).show();
        }
        return;
    }
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}

向清单添加权限

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

Answer 3

描述很好的这里

我就是这么管理的

if(Build.VERSION.SDK_INT < Build.VERSION_CODES.N){
            outputFile = File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS), "ABC.apk")
        } else {
            outputFile = File(filesDir, "ABC.apk")
        }