Question

我无法将图像附加到外部存储的邮件中。我试着用这一行。

Uri image = Uri.parse("/storage/emulated/0/Pictures/park.jpg");

在这种情况下，mail会显示can't attach empty file等消息。

之后我尝试执行以下代码。它显示了一些崩溃报告。我已经完成了一些先前提出的问题。我仍然无法找到完美的答案。

以下是我正在使用的代码......

 Uri image = FileProvider.getUriForFile(this, "com.example.chint.asyntaskexample", new File("/storage/emulated/0/Pictures/", "park.jpg"));

    //Context
    //Package
    //File path (/storage/emulated/0/Pictures/park.jpg)

    Intent i = new Intent(Intent.ACTION_SEND);
    i.putExtra(Intent.EXTRA_STREAM, image);
    i.setType("image*//*");

    Intent chooser = Intent.createChooser(i, "Send Image");
    if (i.resolveActivity(getPackageManager()) != null)
        startActivity(chooser);
    else
        Toast.makeText(this, "Nothing", Toast.LENGTH_SHORT).show();

点击crash按钮后，我收到了share。这是logcat ...

com.example.chint.asyntaskexample E/AndroidRuntime: FATAL EXCEPTION: main
                                                                             Process: com.example.chint.asyntaskexample, PID: 7157
                                                                             java.lang.IllegalStateException: Could not execute method for android:onClick
                                                                                 at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293)
                                                                                 at android.view.View.performClick(View.java:6256)
                                                                                 at android.view.View$PerformClick.run(View.java:24697)
                                                                                 at android.os.Handler.handleCallback(Handler.java:789)
                                                                                 at android.os.Handler.dispatchMessage(Handler.java:98)
                                                                                 at android.os.Looper.loop(Looper.java:164)
                                                                                 at android.app.ActivityThread.main(ActivityThread.java:6541)
                                                                                 at java.lang.reflect.Method.invoke(Native Method)
                                                                                 at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
                                                                                 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
                                                                              Caused by: java.lang.reflect.InvocationTargetException
                                                                                 at java.lang.reflect.Method.invoke(Native Method)
                                                                                 at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
                                                                                 at android.view.View.performClick(View.java:6256) 
                                                                                 at android.view.View$PerformClick.run(View.java:24697) 
                                                                                 at android.os.Handler.handleCallback(Handler.java:789) 
                                                                                 at android.os.Handler.dispatchMessage(Handler.java:98) 
                                                                                 at android.os.Looper.loop(Looper.java:164) 
                                                                                 at android.app.ActivityThread.main(ActivityThread.java:6541) 
                                                                                 at java.lang.reflect.Method.invoke(Native Method) 
                                                                                 at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240) 
                                                                                 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767) 
                                                                              Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.XmlResourceParser android.content.pm.ProviderInfo.loadXmlMetaData(android.content.pm.PackageManager, java.lang.String)' on a null object reference
                                                                                 at android.support.v4.content.FileProvider.parsePathStrategy(FileProvider.java:583)
                                                                                 at android.support.v4.content.FileProvider.getPathStrategy(FileProvider.java:557)
                                                                                 at android.support.v4.content.FileProvider.getUriForFile(FileProvider.java:399)
                                                                                 at com.example.chint.asyntaskexample.MainActivity.sendImage(MainActivity.java:105)
                                                                                 at java.lang.reflect.Method.invoke(Native Method) 
                                                                                 at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288) 
                                                                                 at android.view.View.performClick(View.java:6256) 
                                                                                 at android.view.View$PerformClick.run(View.java:24697) 
                                                                                 at android.os.Handler.handleCallback(Handler.java:789) 
                                                                                 at android.os.Handler.dispatchMessage(Handler.java:98) 
                                                                                 at android.os.Looper.loop(Looper.java:164) 
                                                                                 at android.app.ActivityThread.main(ActivityThread.java:6541) 
                                                                                 at java.lang.reflect.Method.invoke(Native Method) 
                                                                                 at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240) 
                                                                                 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)

请帮帮我..

提前致谢。

Answer 1

Uri image = Uri.parse("/storage/emulated/0/Pictures/park.jpg");

这不是有效的Uri，因为它没有方案。此外，不要硬编码路径。除此之外，这不适用于Android 7.0+，因为已禁止传递file Uri值。

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.XmlResourceParser android.content.pm.ProviderInfo.loadXmlMetaData(android.content.pm.PackageManager, java.lang.String)' on a null object reference

显然，您的<provider>没有FileProvider元素，其权限字符串为com.example.chint.asyntaskexample。

此外，image*//*不是有效的MIME类型。

Answer 2

以下是我想出的答案......

{{1}}

通过外部存储空间

2 个答案: