问MediaStore.ACTION_IMAGE_CAPTURE
EN

Stack Overflow用户

提问于 2014-03-17 12:11:24

回答 1查看 768关注 0票数 0

我使用下面的代码打开一个意图捕获和图像，并返回带有特定request_code的结果

    Intent imageCapture = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    File mediaStorageDir=new File(Environment.getExternalStorageDirectory(),"zzz");
    if (!mediaStorageDir.exists()) {
        if (!mediaStorageDir.mkdirs()) {
            Log.d("zzz", "failed to create directory");
            return null;
        }
    }
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.US).format(new Date());
    Uri imageFile=Uri.fromFile(new File(mediaStorageDir.getPath() + File.separator + "IMG_" + timeStamp + ".jpg"));
    Log.d("zzz",""+imageFile); // to check whether filename is correct or not!!!
    imageCapture.putExtra(MediaStore.EXTRA_OUTPUT, imageFile);      
    startActivityForResult(imageCapture, 1);

这种意图显示了相机捕捉图像的意图，并且一切都做得很好。它也会捕获图像，但就在单击保存按钮时，它遇到了runtimeException。

    03-17 09:34:32.324: E/AndroidRuntime(26771): FATAL EXCEPTION: main
    03-17 09:34:32.324: E/AndroidRuntime(26771): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=null} to activity {idiot.houses.numberslider/idiot.houses.numberslider.MainActivity}: java.lang.NullPointerException
    03-17 09:34:32.324: E/AndroidRuntime(26771):    at android.app.ActivityThread.deliverResults(ActivityThread.java:3205)
    03-17 09:34:32.324: E/AndroidRuntime(26771):    at android.app.ActivityThread.handleSendResult(ActivityThread.java:3248)
    03-17 09:34:32.324: E/AndroidRuntime(26771):    at android.app.ActivityThread.access$1200(ActivityThread.java:140)
    03-17 09:34:32.324: E/AndroidRuntime(26771):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1285)
    03-17 09:34:32.324: E/AndroidRuntime(26771):    at android.os.Handler.dispatchMessage(Handler.java:99)
    03-17 09:34:32.324: E/AndroidRuntime(26771):    at android.os.Looper.loop(Looper.java:137)
    03-17 09:34:32.324: E/AndroidRuntime(26771):    at android.app.ActivityThread.main(ActivityThread.java:4921)
    03-17 09:34:32.324: E/AndroidRuntime(26771):    at java.lang.reflect.Method.invokeNative(Native Method)
    03-17 09:34:32.324: E/AndroidRuntime(26771):    at java.lang.reflect.Method.invoke(Method.java:511)
    03-17 09:34:32.324: E/AndroidRuntime(26771):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
    03-17 09:34:32.324: E/AndroidRuntime(26771):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
    03-17 09:34:32.324: E/AndroidRuntime(26771):    at dalvik.system.NativeStart.main(Native Method)
    03-17 09:34:32.324: E/AndroidRuntime(26771): Caused by: java.lang.NullPointerException
    03-17 09:34:32.324: E/AndroidRuntime(26771):    at edu.vuum.mocca.ui.story.CreateStoryFragment.onActivityResult(CreateStoryFragment.java:316)
    03-17 09:34:32.324: E/AndroidRuntime(26771):    at edu.vuum.mocca.ui.story.StoryActivityBase.onActivityResult(StoryActivityBase.java:291)
    03-17 09:34:32.324: E/AndroidRuntime(26771):    at android.app.Activity.dispatchActivityResult(Activity.java:5372)
    03-17 09:34:32.324: E/AndroidRuntime(26771):    at android.app.ActivityThread.deliverResults(ActivityThread.java:3201)
    03-17 09:34:32.324: E/AndroidRuntime(26771):    ... 11 more

android

android-intent

回答 1

Stack Overflow用户

发布于 2014-03-17 12:35:27

我认为下面的代码对你很有帮助。

//code for calling intent
        String fileName = "temp.jpg";  
        ContentValues values = new ContentValues();  
        values.put(MediaStore.Images.Media.TITLE, fileName);  
        mCapturedImageURI = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);  

        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);  
        intent.putExtra(MediaStore.EXTRA_OUTPUT, mCapturedImageURI);  
        startActivityForResult(intent, PICK_FROM_CAMERA);

//使用onActivityResult()方法编写代码

public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode != Activity.RESULT_OK)
        return;
    switch (requestCode) {

    case PICK_FROM_CAMERA:
        String[] projection = { MediaStore.Images.Media.DATA}; 
        Cursor cursor = managedQuery(mCapturedImageURI, projection, null, null, null); 
        int column_index_data = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); 
        cursor.moveToFirst(); 
        String capturedImageFilePath = cursor.getString(column_index_data);
                   break;
        }
 }

票数 0

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原文链接：

https://stackoverflow.com/questions/22446814

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