我不知道错误在哪里，我的代码是从一个工作正常的项目中复制粘贴的。可以拍摄照片并将其保存到图库中，但是当我想将其加载到图像视图中时，应用程序会崩溃。一直在寻找答案，但所有这些都不适合我。这是应用程序崩溃时的日志，
09-07 10:17:06.371 745-745/henderson.application E/BitmapFactory: Unable to
decode stream: java.io.FileNotFoundException:
/storage/emulated/0/DCIM/Camera/20170907_101702.jpg: open failed: EACCES
(Permission denied)
09-07 10:17:06.381 745-828/henderson.application D/mali_winsys:
new_window_surface returns 0x3000, [1536x2048]-format:1
09-07 10:17:06.411 745-745/henderson.application I/Timeline: Timeline:
Activity_idle id: android.os.BinderProxy@54ccc23 time:51142783
09-07 10:17:13.501 745-745/henderson.application D/ViewRootImpl:
ViewPostImeInputStage processPointer 0
09-07 10:17:13.541 745-745/henderson.application D/ViewRootImpl:
ViewPostImeInputStage processPointer 1
09-07 10:17:13.726 745-745/henderson.application V/ActivityThread:
updateVisibility : ActivityRecord{b1c68e8
token=android.os.BinderProxy@54ccc23
{henderson.application/henderson.application.Application_admin_1}} show :
true
09-07 10:17:15.281 745-745/henderson.application E/BitmapFactory: Unable to
decode stream: java.io.FileNotFoundException:
/storage/emulated/0/DCIM/Camera/20170907_101702.jpg: open failed: EACCES
(Permission denied)
09-07 10:17:15.281 745-745/henderson.application D/AndroidRuntime: Shutting
down VM
09-07 10:17:15.281 745-745/henderson.application E/AndroidRuntime: FATAL
EXCEPTION: main
Process:
henderson.application, PID: 745
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { dat=content://media/external/images/media/526 flg=0x1 (has extras) }} to activity {henderson.application/henderson.application.Application_admin_1}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageView.setBackground(android.graphics.drawable.Drawable)' on a null object reference
at android.app.ActivityThread.deliverResults(ActivityThread.java:4927)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:4970)
at android.app.ActivityThread.access$1600(ActivityThread.java:223)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1851)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7231)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageView.setBackground(android.graphics.drawable.Drawable)' on a null object reference
at henderson.application.Application_admin_1.onActivityResult(Application_admin_1.java:82)
at android.app.Activity.dispatchActivityResult(Activity.java:7138)
at android.app.ActivityThread.deliverResults(ActivityThread.java:4923)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:4970)
at android.app.ActivityThread.access$1600(ActivityThread.java:223)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1851)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7231)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
这是方法
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case SELECTED_PICTURE:
if (resultCode == RESULT_OK) {
Uri uri = data.getData();
String[] projection = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver().query(uri, projection, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(projection[0]);
image_file_path = cursor.getString(columnIndex);
cursor.close();
File f = new File(image_file_path);
if (f.exists()){
Bitmap selectedImage = BitmapFactory.decodeFile(image_file_path);
//Bitmap reducedSizeBitmap = getBitmap(selectedImage);
Drawable d = new BitmapDrawable(selectedImage);
if (btnNo == 1) {
imageViewPLRD.setBackground(d);
} else if (btnNo == 2) {
imageViewIC.setBackground(d);
}
}
}
break;
}
}
这是xml
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:weightSum="2"
android:id="@+id/linearLayoutImage"
android:layout_marginTop="5dp"
android:layout_below="@+id/btnCamera"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:contextClickable="false">
<ImageView
android:layout_width="200dp"
android:layout_height="500dp"
android:id="@+id/imageViewPLRD"
android:layout_marginRight="2dp"
android:layout_weight="1"
android:background="#e4e4e4" />
<ImageView
android:layout_width="200dp"
android:layout_height="500dp"
android:layout_marginLeft="2dp"
android:id="@+id/imageViewIC"
android:layout_weight="1"
android:background="#e4e4e4" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:weightSum="2"
android:id="@+id/linearLayout"
android:layout_below="@+id/linearLayoutImage"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Insert PLRD"
android:id="@+id/btnPLRD"
android:onClick="btnPLRDOnClick"
android:layout_weight="1" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Insert IC"
android:onClick="btn2OnClick"
android:id="@+id/btnIC"
android:layout_weight="1" />
</LinearLayout>
我在调试模式下运行代码并看到声明的Bitmap selectedImage在该行之后为null，但我没有看到错误。
答案 0 :(得分：0)
试试这个：
Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
photoPickerIntent.setType("image/*");
startActivityForResult(photoPickerIntent, RESULT_LOAD_IMG);
以下代码是您的活动结果
@Override
protected void onActivityResult(int reqCode, int resultCode, Intent data) {
super.onActivityResult(reqCode, resultCode, data);
if (resultCode == RESULT_OK) {
try {
final Uri imageUri = data.getData();
final InputStream imageStream = getContentResolver().openInputStream(imageUri);
final Bitmap selectedImage = BitmapFactory.decodeStream(imageStream);
image_view.setImageBitmap(selectedImage);
} catch (FileNotFoundException e) {
e.printStackTrace();
Toast.makeText(PostImage.this, "Something went wrong", Toast.LENGTH_LONG).show();
}
}else {
Toast.makeText(PostImage.this, "You haven't picked Image",Toast.LENGTH_LONG).show();
}
}
答案 1 :(得分：0)
尝试这个......我已经多次使用过了....并且还检查了许可
AndroidManifest.xml中的权限==＆gt;
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
通话方式=====＆gt;
private void getImagefromGallery() {
if (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT) {
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("image/*");
startActivityForResult(
Intent.createChooser(intent, "Complete action using"),
RESULT_FROM_GALLERY);
} else {
Intent mediaChooser = new Intent(Intent.ACTION_PICK);
mediaChooser.setType("image/*");
startActivityForResult(mediaChooser, RESULT_FROM_GALLERY);
}
}
关于活动结果方法====＆gt;
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
switch (resultCode) {
case RESULT_OK:
if (requestCode == RESULT_FROM_GALLERY) {
String picturePath = "";
Uri selectedUri = data.getData();
Log.d("videopathyri===>", String.valueOf(selectedUri));
Intent intent = new Intent(getApplicationContext(),
MainActivityCrop.class);
intent.putExtra("baseimage", selectedUri);
startActivity(intent);
}
break;
default:
break;
}
}