相关疑难解决方法(0)

这是我播放录制的音频3gp文件的代码

 Intent intent = new Intent(android.content.Intent.ACTION_VIEW);
        Uri data = Uri.parse(path);
        intent.setDataAndType(data, "audio/mp3");
        startActivity(intent);

但是在我的HTC设备(Android 2.2 Froyo)中运行它时会显示异常:

05-04 16:37:37.597: WARN/System.err(4065): android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.VIEW dat=/mnt/sdcard/mnt/sdcard/audio-android.3gp typ=audio/mp3 }
05-04 16:37:37.597: WARN/System.err(4065):     at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1567)
05-04 16:37:37.597: INFO/ActivityManager(92): Starting activity: Intent { act=android.intent.action.VIEW dat=/mnt/sdcard/mnt/sdcard/audio-android.3gp typ=audio/mp3 }
05-04 16:37:37.607: WARN/System.err(4065):     at android.app.Instrumentation.execStartActivity(Instrumentation.java:1537)
05-04 16:37:37.607: WARN/System.err(4065):     at android.app.Activity.startActivityForResult(Activity.java:2858)
05-04 16:37:37.607: WARN/System.err(4065):     at android.app.Activity.startActivity(Activity.java:2964)
05-04 16:37:37.607: WARN/System.err(4065):     at com.ey.camera.AudioRecorder.playAudio(AudioRecorder.java:244)
05-04 16:37:37.607: WARN/System.err(4065):     at com.ey.camera.AudioRecorder$4.onClick(AudioRecorder.java:225)
05-04 16:37:37.607: WARN/System.err(4065):     at android.view.View.performClick(View.java:2408)
05-04 16:37:37.607: WARN/System.err(4065): …

查看intent.resolveActivity != null 但启动 Intent 会引发 ActivityNotFound 异常，我在打开浏览器或具有深度链接的应用程序时写道：

private fun openUrl(url: String) {
    val intent = Intent().apply {
        action = Intent.ACTION_VIEW
        data = Uri.parse(url)
//        setDataAndType(Uri.parse(url), "text/html")
//        component = ComponentName("com.android.browser", "com.android.browser.BrowserActivity")
//        flags = Intent.FLAG_ACTIVITY_CLEAR_TOP + Intent.FLAG_GRANT_READ_URI_PERMISSION
    }
    val activityInfo = intent.resolveActivityInfo(packageManager, intent.flags)
    if (activityInfo?.exported == true) {
        startActivity(intent)
    } else {
        Toast.makeText(
            this,
            "No application can handle the link",
            Toast.LENGTH_SHORT
        ).show()
    }
}

它不起作用。在 API 30 模拟器中找不到浏览器，而一个常见的解决方案有效：

private fun openUrl(url: String) {
    val intent …

我想在用户点击按钮时打开PDF文件.目前,我正在使用此代码来实现此目的:

Uri path = Uri.fromFile(new File("file:///android_asset/regola11_1.pdf"));
            Intent pdfIntent = new Intent(Intent.ACTION_VIEW);
            pdfIntent.setDataAndType(path, "application/pdf");
            pdfIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            startActivity(pdfIntent);

但它不起作用.

当我选择使用Adobe Acrobat时,我会收到一条显示为Toast的消息

"This file could not be accessed Check the location or the network and try again."

当我尝试使用Drive PDF Viewer时,我明白了

"Cannot display PDF ( regola11_1.pdf cannot be opened)"

PDF文件存储在

app > build > intermediates > assets

问题出在哪儿？

编辑

现在我使用以下代码:

File file = new File("\"file:///android_asset/regola11_1.pdf");
            Uri path = Uri.fromFile(file);
            Intent intent = new Intent(Intent.ACTION_VIEW);
            intent.setDataAndType(path, "application/pdf");
            intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

            try {
                context.startActivity(intent);
            }
            catch (ActivityNotFoundException e) { …