Question

这个代码在其他设备中运行就像魅力，但在nexus 5（ OS版本5.1.1 ）中无法运行它。

当我在nexus 5中运行以下代码时，我得到NullPointerException， resultCode = 0 的值和 RESULT_OK = -1 的值，因此我的 if getActivityForResult中的条件不运行。

而在其他设备（其他模型，如三星，htc等）中，相同的代码运行就像魅力没有和例外， resultCode = -1 和 RESULT_OK = -1 < / strong>，两个值都相同，所以if条件运行，因此我的程序的其余部分。

JAVA CODE mainActivity.java

public void callCamera() { Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri); // start the image capture Intent startActivityForResult(intent, 100); Log.i("hello", "callCamera"); } protected void onActivityResult(int requestCode, int resultCode, Intent data) { Log.i("hello", "" + requestCode); Log.i("hello", "" + resultCode); Log.i("hello", "" + this.RESULT_OK); if (requestCode == 100 && resultCode == RESULT_OK) { // fileUri=data.getExtras().get("data"); photo = (Bitmap) data.getExtras().get("data"); //*selectedImage = data.getData(); //photo = (Bitmap) data.getExtras().get("data"); Log.i("hello","onActivityResult"); uploadImage(); } }

NEXUS 5案例中的LOGCAT

FATAL EXCEPTION: main Process: com.google.android.GoogleCamera, PID: 24887 java.lang.NullPointerException at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:187) at com.google.common.base.Optional.of(Optional.java:84) at com.android.camera.captureintent.state.StateSavingPicture.onEnter(StateSavingPicture.java:77) at com.android.camera.captureintent.stateful.StateMachineImpl.jumpToState(StateMachineImpl.java:62) at com.android.camera.captureintent.stateful.StateMachineImpl.processEvent(StateMachineImpl.java:110) at com.android.camera.captureintent.state.StateOpeningCamera$9.onClick(StateOpeningCamera.java:307) at android.view.View.performClick(View.java:4780) at android.view.View$PerformClick.run(View.java:19866) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5254) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

Answer 1

从callCamera（）方法中删除intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);行，这将修复崩溃。好像你从onActivityResult（）意图中获取uri然后意图将数据作为null返回，因为你在启动相机意图时在意图中添加了额外的uri值，这定义了你已经有一个文件uri对于你的相机图像，你不想在onActivityResult（）中有数据意图，我也建议你删除callCamera（）方法中使用的fileuri变量，因为它没用。

所以你的callCamera方法应如下所示：

public void callCamera() {

Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent, 100);
}

Answer 2

/*** Created by wildcoder on 06/06/16.*/
import android.Manifest;
import android.app.Activity;
import android.content.ContentResolver;
import android.content.Intent;
import android.media.CameraProfile;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.widget.Toast;
public class FragmentVideoRecorder extends BaseFragment {

private Uri fileUri;
private static final int CAPTURE_VIDEO_ACTIVITY_REQUEST_CODE = 200;
public static Activity ActivityContext = null;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    ActivityContext = getActivity();
}


/**
 * @param parentDirectory Your folder name
 */
protected void startRecording(File parentDirectory) {
    if (Utilities.isGranted(getActivity(), Manifest.permission.RECORD_AUDIO) && Utilities.isGranted(getActivity(), Manifest.permission.CAMERA)) {
        Intent intent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
        // create a file to save the video
        fileUri = getOutputMediaFileUri(parentDirectory);
        // set the image file name
        intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
        intent.putExtra(MediaStore.EXTRA_SIZE_LIMIT, 10000000);
        // set the video image quality to high
        intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, CameraProfile.QUALITY_LOW);
        // start the Video Capture Intent
        startActivityForResult(intent, CAPTURE_VIDEO_ACTIVITY_REQUEST_CODE);
    } else {
        Utilities.openAppSetting(ActivityContext);
    }

}


/**
 * @param contentResolver
 * @param file            to delete
 */
public void deleteFileFromMediaStore(final ContentResolver contentResolver, final File file) {
    String canonicalPath;
    try {
        canonicalPath = file.getCanonicalPath();
    } catch (IOException e) {
        canonicalPath = file.getAbsolutePath();
    }
    final Uri uri = MediaStore.Files.getContentUri("external");
    final int result = contentResolver.delete(uri,
            MediaStore.Files.FileColumns.DATA + "=?", new String[]{canonicalPath});
    if (result == 0) {
        final String absolutePath = file.getAbsolutePath();
        if (!absolutePath.equals(canonicalPath)) {
            contentResolver.delete(uri,
                    MediaStore.Files.FileColumns.DATA + "=?", new String[]{absolutePath});
        }
    }
}

/**
 * Create a file Uri for saving an image or video
 */
private Uri getOutputMediaFileUri(File parent) {
    return Uri.fromFile(getOutputMediaFile(parent));
}

/**
 * Create a File for saving an image or video
 */
private File getOutputMediaFile(File mediaStorageDir) {
    // Check that the SDCard is mounted
    // Create the storage directory(MyCameraVideo) if it does not exist
    if (!mediaStorageDir.exists()) {
        if (!mediaStorageDir.mkdirs()) {
            Toast.makeText(ActivityContext, "Failed to create directory MyCameraVideo.",
                    Toast.LENGTH_LONG).show();
            Log.d("MyCameraVideo", "Failed to create directory MyCameraVideo.");
            return null;
        }
    }
    File mediaFile = new File(mediaStorageDir, "intro_video.mp4");
    if (mediaFile.exists()) {
        deleteFileFromMediaStore(ActivityContext.getContentResolver(), mediaFile);
    }
    return mediaFile;
}


@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    // After camera screen this code will excuted
    if (requestCode == CAPTURE_VIDEO_ACTIVITY_REQUEST_CODE) {
        if (resultCode == Activity.RESULT_OK) {
            // Video captured and saved to fileUri specified in the Intent
            Toast.makeText(ActivityContext, "Video saved to: " + data.getData(), Toast.LENGTH_LONG).show();

        } else if (resultCode == Activity.RESULT_CANCELED) {

            // User cancelled the video capture
            Toast.makeText(ActivityContext, "User cancelled the video capture.",
                    Toast.LENGTH_LONG).show();

        } else {
            // Video capture failed, advise user
            Toast.makeText(ActivityContext, "Video capture failed.",
                    Toast.LENGTH_LONG).show();
        }
    }
}

}

Answer 3

确保在捕获视频后点击刻度线（Nexus 5中的蓝色，Android 8）。只有在勾选后才将结果设置为RESULT_OK。如果单击任何其他按钮，则不会正确设置结果代码。

Answer 4

问题在于 Android 11 要求您使用 Fileprovider。解决方案：

[1] 确保您使用 FileProvider 生成 fileUri，例如：

File outputDir = getExternalCacheDir();
File out = File.createTempFile("android_upload", ".jpg", outputDir);
fileUri = FileProvider.getUriForFile(this, "com.your.app.id.fileprovider", out);

（将 com.your.app.id 替换为您的应用程序 ID）。

[2] 添加到您的 AndroidManifest.xml：

 <provider
        android:name="android.support.v4.content.FileProvider"
        android:authorities="com.your.app.id.fileprovider"
        android:exported="false"
        android:grantUriPermissions="true">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/file_provider_paths"/>
 </provider>

[3] 创建文件 res/xml/file_provider_paths.xml:

<paths>
    <external-cache-path name="cache" path="/" />
</paths>

相机结果代码和RESULT_OK不相等，应用程序在相机意图后仅在nexus 5（棒棒糖）中崩溃

4 个答案: