Android 从apk文件启动活动

我正在尝试从外部apk文件启动活动。 apk文件是一个简单的文本显示，我将它从URL下载到本地挂载目录/mnt/sdcard/。在这一点上，一切都很顺利。 现在，我想从该文件启动一个活动，但出现了错误。两种类型，取决于施工意图。下面是具有相关LogCat的两个实现，“targetFilePath”是相同的。 案例一：

日志：

08-26 17:03:02.153: I/ActivityManager(59): Starting activity: Intent { act=android.intent.action.VIEW typ=application/vnd.android.package-archive }
08-26 17:03:02.153: W/System.err(390): android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.VIEW typ=application/vnd.android.package-archive }
08-26 17:03:02.162: W/System.err(390):  at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1408)
08-26 17:03:02.162: W/System.err(390):  at android.app.Instrumentation.execStartActivity(Instrumentation.java:1378)
08-26 17:03:02.162: W/System.err(390):  at android.app.Activity.startActivityForResult(Activity.java:2817)
08-26 17:03:02.162: W/System.err(390):  at android.app.Activity.startActivity(Activity.java:2923)
08-26 17:03:02.162: W/System.err(390):  at com.agorasoft.sandbox.DownloadFile$1.onClick(DownloadFile.java:137)
08-26 17:03:02.162: W/System.err(390):  at android.view.View.performClick(View.java:2408)
08-26 17:03:02.172: W/System.err(390):  at android.view.View$PerformClick.run(View.java:8816)
08-26 17:03:02.172: W/System.err(390):  at android.os.Handler.handleCallback(Handler.java:587)
08-26 17:03:02.172: W/System.err(390):  at android.os.Handler.dispatchMessage(Handler.java:92)
08-26 17:03:02.172: W/System.err(390):  at android.os.Looper.loop(Looper.java:123)
08-26 17:03:02.182: W/System.err(390):  at android.app.ActivityThread.main(ActivityThread.java:4627)
08-26 17:03:02.182: W/System.err(390):  at java.lang.reflect.Method.invokeNative(Native Method)
08-26 17:03:02.182: W/System.err(390):  at java.lang.reflect.Method.invoke(Method.java:521)
08-26 17:03:02.182: W/System.err(390):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
08-26 17:03:02.182: W/System.err(390):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
08-26 17:03:02.182: W/System.err(390):  at dalvik.system.NativeStart.main(Native Method)
08-26 17:03:21.761: D/SntpClient(59): request time failed: java.net.SocketException: Address family not supported by protocol

案例二：

try {
    Intent intent = new Intent(Intent.ACTION_VIEW);
    Uri apkUri = Uri.fromFile(new File(targetFilePath));
    intent.setDataAndType(apkUri, "application/vnd.android.package-archive");
    startActivity(intent);
}
catch (Exception e) {
    e.printStackTrace();
    Toast.makeText(DownloadFile.this, "apk file launch error: " +   e.getMessage(), Toast.LENGTH_LONG).show();
}

解析错误弹出窗口：解析包时出现问题

日志：

08-26 17:09:48.862: W/PackageParser(329): Unable to read AndroidManifest.xml of /mnt/sdcard/Downloads/ApkTest.apk
08-26 17:09:48.862: W/PackageParser(329): java.io.FileNotFoundException: AndroidManifest.xml
08-26 17:09:48.862: W/PackageParser(329):   at android.content.res.AssetManager.openXmlAssetNative(Native Method)
08-26 17:09:48.862: W/PackageParser(329):   at android.content.res.AssetManager.openXmlBlockAsset(AssetManager.java:485)
08-26 17:09:48.862: W/PackageParser(329):   at android.content.res.AssetManager.openXmlResourceParser(AssetManager.java:453)
08-26 17:09:48.862: W/PackageParser(329):   at android.content.pm.PackageParser.parsePackage(PackageParser.java:396)
08-26 17:09:48.862: W/PackageParser(329):   at com.android.packageinstaller.PackageUtil.getPackageInfo(PackageUtil.java:79)
08-26 17:09:48.862: W/PackageParser(329):   at com.android.packageinstaller.PackageInstallerActivity.onCreate(PackageInstallerActivity.java:242)
08-26 17:09:48.862: W/PackageParser(329):   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
08-26 17:09:48.862: W/PackageParser(329):   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
08-26 17:09:48.862: W/PackageParser(329):   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
08-26 17:09:48.862: W/PackageParser(329):   at android.app.ActivityThread.access$2300(ActivityThread.java:125)
08-26 17:09:48.862: W/PackageParser(329):   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
08-26 17:09:48.862: W/PackageParser(329):   at android.os.Handler.dispatchMessage(Handler.java:99)
08-26 17:09:48.862: W/PackageParser(329):   at android.os.Looper.loop(Looper.java:123)
08-26 17:09:48.862: W/PackageParser(329):   at android.app.ActivityThread.main(ActivityThread.java:4627)
08-26 17:09:48.862: W/PackageParser(329):   at java.lang.reflect.Method.invokeNative(Native Method)
08-26 17:09:48.862: W/PackageParser(329):   at java.lang.reflect.Method.invoke(Method.java:521)
08-26 17:09:48.862: W/PackageParser(329):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
08-26 17:09:48.862: W/PackageParser(329):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
08-26 17:09:48.862: W/PackageParser(329):   at dalvik.system.NativeStart.main(Native Method)
08-26 17:09:48.862: W/PackageInstaller(329): Parse error when parsing manifest. Discontinuing installation
08-26 17:09:49.902: I/ActivityManager(59): Displayed activity com.android.packageinstaller/.PackageInstallerActivity: 1168 ms (total 1168 ms)

对于冗长的争论很抱歉，但首先，它不起作用，然后我对intent/install定义的两个语法有不同的行为，这似乎很奇怪。 调用应用程序和apk文件都具有相同的SDK target/min版本。调用应用程序清单中没有为这段代码设置特殊权限（我需要吗？）。

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谢谢

文档保存了您的答案：

这用于创建只指定类型而不指定数据的意图，例如，用于指示要返回的数据类型

此方法自动清除以前设置的任何数据（例如，通过setData（Uri））

还有你的文件

此方法应很少使用——它允许您使用此处给定的类型覆盖通常从数据推断的MIME类型

简而言之，在构造此意图时不需要指定类型，它将根据给定URI的数据本身进行推断

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尽管如此，nandeesh的评论似乎是正确的——您试图安装的软件包看起来已损坏。还值得注意的是，如果您打算将此应用发布到Play Store，则开发者协议不允许下载或安装其他apk的应用。

第二种情况似乎是正确的，但您下载的apk已损坏，这就是为什么它会崩溃的原因。下载的文件确实被破坏了，我无法想象它是从那来的，但是一个简单的cmp检查马上就出现了。嘿，阿达姆，你能帮我解决这个问题吗

08-26 17:09:48.862: W/PackageParser(329): Unable to read AndroidManifest.xml of /mnt/sdcard/Downloads/ApkTest.apk
08-26 17:09:48.862: W/PackageParser(329): java.io.FileNotFoundException: AndroidManifest.xml
08-26 17:09:48.862: W/PackageParser(329):   at android.content.res.AssetManager.openXmlAssetNative(Native Method)
08-26 17:09:48.862: W/PackageParser(329):   at android.content.res.AssetManager.openXmlBlockAsset(AssetManager.java:485)
08-26 17:09:48.862: W/PackageParser(329):   at android.content.res.AssetManager.openXmlResourceParser(AssetManager.java:453)
08-26 17:09:48.862: W/PackageParser(329):   at android.content.pm.PackageParser.parsePackage(PackageParser.java:396)
08-26 17:09:48.862: W/PackageParser(329):   at com.android.packageinstaller.PackageUtil.getPackageInfo(PackageUtil.java:79)
08-26 17:09:48.862: W/PackageParser(329):   at com.android.packageinstaller.PackageInstallerActivity.onCreate(PackageInstallerActivity.java:242)
08-26 17:09:48.862: W/PackageParser(329):   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
08-26 17:09:48.862: W/PackageParser(329):   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
08-26 17:09:48.862: W/PackageParser(329):   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
08-26 17:09:48.862: W/PackageParser(329):   at android.app.ActivityThread.access$2300(ActivityThread.java:125)
08-26 17:09:48.862: W/PackageParser(329):   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
08-26 17:09:48.862: W/PackageParser(329):   at android.os.Handler.dispatchMessage(Handler.java:99)
08-26 17:09:48.862: W/PackageParser(329):   at android.os.Looper.loop(Looper.java:123)
08-26 17:09:48.862: W/PackageParser(329):   at android.app.ActivityThread.main(ActivityThread.java:4627)
08-26 17:09:48.862: W/PackageParser(329):   at java.lang.reflect.Method.invokeNative(Native Method)
08-26 17:09:48.862: W/PackageParser(329):   at java.lang.reflect.Method.invoke(Method.java:521)
08-26 17:09:48.862: W/PackageParser(329):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
08-26 17:09:48.862: W/PackageParser(329):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
08-26 17:09:48.862: W/PackageParser(329):   at dalvik.system.NativeStart.main(Native Method)
08-26 17:09:48.862: W/PackageInstaller(329): Parse error when parsing manifest. Discontinuing installation
08-26 17:09:49.902: I/ActivityManager(59): Displayed activity com.android.packageinstaller/.PackageInstallerActivity: 1168 ms (total 1168 ms)