我正在尝试按照Google文档与相机拍照。它工作正常，并将图像存储在适当的文件夹中。但是，一旦拍摄照片，相机中会出现两个选项：重试和确定。当我单击确定时，应用程序崩溃。错误在下面评论。有没有人有任何想法。感谢
package com.example.tauheed.cameraapplication;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v4.content.FileProvider;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.EventLogTags;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class MainActivity extends AppCompatActivity {
static final int REQUEST_IMAGE_CAPTURE = 1;
private static final String LOGTAG = "MainActivity"; //Use this to Filter Out Log Details
Button btn1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn1 = findViewById(R.id.myButton);
}
//Start Camera from Button TO Intent
public void StartCamera(View view) {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
Log.i(LOGTAG, "test output");
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
}
}
//Show Camera image in Image View //onActivityResult returns a result from activity
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode,resultCode,data);
if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
//Crash App Here when I press ok
Bundle extras = data.getExtras();
Bitmap imageBitmap = (Bitmap) extras.get("data");
ImageView mImageView;
mImageView = (ImageView) findViewById(R.id.imgV);
mImageView.setImageBitmap(imageBitmap);
}
}
//C:\Users\tauheed\AndroidStudioProjects\CameraApplication\app\src\main\java\com\example\tauheed\cameraapplication
//Path to store Picture
String mCurrentPhotoPath;
//Create file to hold the picture named JPEG PLUS THE TIME STAMP OF PHOTO
private File createImageFile() throws IOException {
// Create an image file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
File image = File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
storageDir /* directory */
);
// Save a file: path for use with ACTION_VIEW intents
mCurrentPhotoPath = image.getAbsolutePath();
return image;
}
//Send the picture back through the intent
static final int REQUEST_TAKE_PHOTO = 1;
public void dispatchTakePictureIntent(View view) {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
// Ensure that there's a camera activity to handle the intent
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
// Create the File where the photo should go
File photoFile = null;
try {
photoFile = createImageFile();
} catch (IOException ex) {
// Error occurred while creating the File
ex.printStackTrace();
Toast.makeText(this,"Error",Toast.LENGTH_SHORT).show();
}
// Continue only if the File was successfully created
if (photoFile != null) {
Uri photoURI = FileProvider.getUriForFile(this,
"com.example.android.fileprovider",
photoFile);
Log.i(LOGTAG, "photo uri: "+photoURI);
Log.i(LOGTAG, "photo file: "+photoFile);
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
}
}
}
private void galleryAddPic() {
Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
File f = new File(mCurrentPhotoPath);
Uri contentUri = Uri.fromFile(f);
mediaScanIntent.setData(contentUri);
this.sendBroadcast(mediaScanIntent);
}
private void setPic() {
// Get the dimensions of the View
ImageView mImageView;
mImageView = (ImageView) findViewById(R.id.imgV);
int targetW = mImageView.getWidth();
int targetH = mImageView.getHeight();
// Get the dimensions of the bitmap
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
bmOptions.inJustDecodeBounds = true;
BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
int photoW = bmOptions.outWidth;
int photoH = bmOptions.outHeight;
// Determine how much to scale down the image
int scaleFactor = Math.min(photoW/targetW, photoH/targetH);
// Decode the image file into a Bitmap sized to fill the View
bmOptions.inJustDecodeBounds = false;
bmOptions.inSampleSize = scaleFactor;
bmOptions.inPurgeable = true;
Bitmap bitmap = BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
mImageView.setImageBitmap(bitmap);
}
}
}
记录信息：
05/02 10:06:28: Launching app
$ adb install-multiple -r -t -p com.example.tauheed.cameraapplication C:\Users\tauheed\AndroidStudioProjects\CameraApplication\app\build\intermediates\split-apk\debug\slices\slice_4.apk C:\Users\tauheed\AndroidStudioProjects\CameraApplication\app\build\intermediates\instant-run-apk\debug\app-debug.apk
Split APKs installed
$ adb shell am start -n "com.example.tauheed.cameraapplication/com.example.tauheed.cameraapplication.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER -D
Waiting for application to come online: com.example.tauheed.cameraapplication | com.example.tauheed.cameraapplication.test
Waiting for application to come online: com.example.tauheed.cameraapplication | com.example.tauheed.cameraapplication.test
Waiting for application to come online: com.example.tauheed.cameraapplication | com.example.tauheed.cameraapplication.test
Waiting for application to come online: com.example.tauheed.cameraapplication | com.example.tauheed.cameraapplication.test
Connecting to com.example.tauheed.cameraapplication
Connected to the target VM, address: 'localhost:8604', transport: 'socket'
Capturing and displaying logcat messages from application. This behavior can be disabled in the "Logcat output" section of the "Debugger" settings page.
I/art: Debugger is active
I/System.out: Debugger has connected
waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: debugger has settled (1479)
W/System: ClassLoader referenced unknown path: /data/app/com.example.tauheed.cameraapplication-1/lib/arm64
I/InstantRun: starting instant run server: is main process
W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
D/TextView: setTypeface with style : 0
D/TextView: setTypeface with style : 0
D/TextView: setTypeface with style : 0
D/ViewRootImpl@648e444[MainActivity]: ThreadedRenderer.create() translucent=false
D/InputTransport: Input channel constructed: fd=70
D/ViewRootImpl@648e444[MainActivity]: setView = DecorView@c1a9e62[MainActivity] touchMode=true
D/ViewRootImpl@648e444[MainActivity]: dispatchAttachedToWindow
D/ViewRootImpl@648e444[MainActivity]: Relayout returned: oldFrame=[0,0][0,0] newFrame=[0,0][1440,2560] result=0x27 surface={isValid=true 523090896384} surfaceGenerationChanged=true
D/ViewRootImpl@648e444[MainActivity]: mHardwareRenderer.initialize() mSurface={isValid=true 523090896384} hwInitialized=true
D/libEGL: loaded /vendor/lib64/egl/libGLES_mali.so
I/OpenGLRenderer: Initialized EGL, version 1.4
D/OpenGLRenderer: Swap behavior 1
D/mali_winsys: EGLint new_window_surface(egl_winsys_display*, void*, EGLSurface, EGLConfig, egl_winsys_surface**, egl_color_buffer_format*, EGLBoolean) returns 0x3000, [1440x2560]-format:1
W/art: Before Android 4.1, method int android.support.v7.widget.DropDownListView.lookForSelectablePosition(int, boolean) would have incorrectly overridden the package-private method in android.widget.ListView
D/ViewRootImpl@648e444[MainActivity]: MSG_RESIZED_REPORT: ci=Rect(0, 96 - 0, 0) vi=Rect(0, 96 - 0, 0) or=1
MSG_WINDOW_FOCUS_CHANGED 1
D/ViewRootImpl@648e444[MainActivity]: mHardwareRenderer.initializeIfNeeded()#2 mSurface={isValid=true 523090896384}
V/InputMethodManager: Starting input: tba=android.view.inputmethod.EditorInfo@355b62f nm : com.example.tauheed.cameraapplication ic=null
I/InputMethodManager: [IMM] startInputInner - mService.startInputOrWindowGainedFocus
D/InputTransport: Input channel constructed: fd=81
V/InputMethodManager: Starting input: tba=android.view.inputmethod.EditorInfo@5b143c nm : com.example.tauheed.cameraapplication ic=null
D/ViewRootImpl@648e444[MainActivity]: ViewPostImeInputStage processPointer 0
W/System: ClassLoader referenced unknown path: /system/framework/QPerformance.jar
E/BoostFramework: BoostFramework() : Exception_1 = java.lang.ClassNotFoundException: Didn't find class "com.qualcomm.qti.Performance" on path: DexPathList[[],nativeLibraryDirectories=[/system/lib64, /vendor/lib64]]
V/BoostFramework: BoostFramework() : mPerf = null
D/ViewRootImpl@648e444[MainActivity]: ViewPostImeInputStage processPointer 1
I/MainActivity: photo uri: content://com.example.android.fileprovider/test_folder/JPEG_20180502_100721_1084476579.jpg
I/MainActivity: photo file: /storage/emulated/0/Android/data/com.example.tauheed.cameraapplication/files/Pictures/JPEG_20180502_100721_1084476579.jpg
D/ViewRootImpl@648e444[MainActivity]: MSG_WINDOW_FOCUS_CHANGED 0
D/OpenGLRenderer: endAllActiveAnimators on 0x79b998c400 (RippleDrawable) with handle 0x79a843a180
D/ViewRootImpl@648e444[MainActivity]: mHardwareRenderer.destroy()#1
D/ViewRootImpl@648e444[MainActivity]: Relayout returned: oldFrame=[0,0][1440,2560] newFrame=[0,0][1440,2560] result=0x5 surface={isValid=false 0} surfaceGenerationChanged=true
D/InputTransport: Input channel destroyed: fd=81
D/ViewRootImpl@648e444[MainActivity]: mHardwareRenderer.destroy()#1
D/ViewRootImpl@648e444[MainActivity]: Relayout returned: oldFrame=[0,0][1440,2560] newFrame=[0,0][1440,2560] result=0x1 surface={isValid=false 0} surfaceGenerationChanged=false
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.tauheed.cameraapplication, PID: 5507
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=null} to activity {com.example.tauheed.cameraapplication/com.example.tauheed.cameraapplication.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.os.Bundle android.content.Intent.getExtras()' on a null object reference
at android.app.ActivityThread.deliverResults(ActivityThread.java:4472)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:4515)
at android.app.ActivityThread.-wrap22(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1687)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6682)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.os.Bundle android.content.Intent.getExtras()' on a null object reference
at com.example.tauheed.cameraapplication.MainActivity.onActivityResult(MainActivity.java:47)
at android.app.Activity.dispatchActivityResult(Activity.java:7256)
at android.app.ActivityThread.deliverResults(ActivityThread.java:4468)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:4515)
at android.app.ActivityThread.-wrap22(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1687)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6682)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410)
Disconnected from the target VM, address: 'localhost:8604', transport: 'socket'
答案 0 :(得分：0)
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.tauheed.cameraapplication, PID: 5507
java.lang.RuntimeException：传递结果失败 ResultInfo {who = null，request = 1，result = -1，data = null}到activity {com.example.tauheed.cameraapplication / com.example.tauheed.cameraapplication.MainActivity}： java.lang.NullPointerException：尝试调用虚方法
'android.os.Bundle android.content.Intent.getExtras()' on a null object reference
at android.app.ActivityThread.deliverResults(ActivityThread.java:4472)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:4515)
at android.app.ActivityThread.-wrap22(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1687)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6682)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.os.Bundle android.content.Intent.getExtras()' on a null object reference
at com.example.tauheed.cameraapplication.MainActivity.onActivityResult(MainActivity.java:47)
at android.app.Activity.dispatchActivityResult(Activity.java:7256)
at android.app.ActivityThread.deliverResults(ActivityThread.java:4468)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:4515)
at android.app.ActivityThread.-wrap22(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1687)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6682)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410)
Disconnected from the target VM, address: 'localhost:8604', transport: 'socket'
检查您发送的是什么，因为data中的protected void onActivityResult(int requestCode, int resultCode, Intent data)对象为空。从那里开始出现问题。
因此，当您致电startActivityForResult()时请记住，您还需要传递Intent案例中的takePictureIntent：startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO,takePictureIntent);。您需要在public void dispatchTakePictureIntent(View view){}方法中使用Intent之类的内容，以便传递NoSuchMethodException。
希望有帮助:)