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我是Android新手，希望能在这里找到解决方案。 在我的活动中，我可以拍照并从画廊中选择它。按下保存按钮后，应用程序应将图像保存在数据库中。但我得到的是以下错误：Android - 试图保存图像时应用程序崩溃
08-17 22:52:41.326 2683-2697/android.process.media E/DatabaseUtils: Writing exception to parcel
java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/images/media/35 from pid=4424, uid=10060 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()
at android.content.ContentProvider.enforceReadPermissionInner(ContentProvider.java:605)
at android.content.ContentProvider$Transport.enforceReadPermission(ContentProvider.java:480)
at android.content.ContentProvider$Transport.enforceFilePermission(ContentProvider.java:471)
at android.content.ContentProvider$Transport.openTypedAssetFile(ContentProvider.java:416)
at android.content.ContentProviderNative.onTransact(ContentProviderNative.java:313)
at android.os.Binder.execTransact(Binder.java:453)
08-17 22:42:31.929 4290-4290/com.group6.travlhoe E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.group6.travlhoe, PID: 4290
java.lang.NullPointerException: Attempt to invoke virtual method 'android.graphics.Bitmap android.graphics.drawable.BitmapDrawable.getBitmap()' on a null object reference
at com.group6.TakeOff.activity_unterkunft.imageViewToByte(activity_unterkunft.java:187)
at com.group6.TakeOff.activity_unterkunft$3.onClick(activity_unterkunft.java:205)
at android.view.View.performClick(View.java:5198)
at android.view.View$PerformClick.run(View.java:21147)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
我的Java代码： 公共类activity_unterkunft扩展AppCompatActivity {
DatabaseHelper myDb;
Button btn_save;
Spinner ChooseProject;
EditText Entfernung,Price,MWST;
String selectedspinner;
ImageView imageView6;
private static int PICK_IMAGE = 100;
Uri imageUri;
private BottomNavigationViewEx bottomNavigationViewEx;
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_unterkunft);
myDb = new DatabaseHelper(this);
ChooseProject = (Spinner) findViewById(R.id.ChooseProject);
Entfernung = (EditText) findViewById(R.id.Entfernung);
Price = (EditText) findViewById(R.id.Preis);
MWST = (EditText) findViewById(R.id.MwSt);
btn_save=(Button) findViewById(R.id.btn_save);
ImageButton btnCamera= (ImageButton)findViewById(R.id.btnCamera);
imageView6=(ImageView) findViewById(R.id.imageView6);
loadSpinnerData();
SaveData();
//CameraInitialisierung
StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder();
StrictMode.setVmPolicy(builder.build());
builder.detectFileUriExposure();
//++++++++++++BOTTOM NAVIGATION BAR++++++++++++//
bottomNavigationViewEx = (BottomNavigationViewEx) findViewById(R.id.bottomNavigationView);
bottomNavigationViewEx.setOnNavigationItemSelectedListener(new BottomNavigationViewEx.OnNavigationItemSelectedListener(){
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item){
if (item.getItemId()==R.id.menu_start){
startActivity(new Intent(activity_unterkunft.this, MainActivity.class));
} else if(item.getItemId()==R.id.menu_allgemein){
startActivity(new Intent(activity_unterkunft.this, activity_allgemein.class));
} else if(item.getItemId()==R.id.menu_transport){
startActivity(new Intent(activity_unterkunft.this, activity_transport.class));
} else if(item.getItemId()==R.id.menu_rechnung){
startActivity(new Intent(activity_unterkunft.this, activity_rechnung.class));
} else if(item.getItemId()==R.id.menu_unterkunft){
startActivity(new Intent(activity_unterkunft.this, activity_unterkunft.class));
}
return true;
}
});
bottomNavigationViewEx.setSelectedItemId(R.id.menu_unterkunft);
BottomNavigationViewHelper.setupBottomNavigationView(bottomNavigationViewEx);
}
public void onButtonClicked(View v){
if(v.getId()==R.id.btnCamera) {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File pictureDirectory = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
String pictureName= getPictureName();
File imageFile= new File(pictureDirectory,pictureName);
//URI weil putExtra sonst nicht mit File elementen klar kommt!
Uri pictureUri = Uri.fromFile(imageFile);
intent.putExtra(MediaStore.EXTRA_OUTPUT, pictureUri);
startActivityForResult(intent, 0);
}
if(v.getId()==R.id.goToGPS) {
//Intent intent2 = new Intent(activity_unterkunft.this, function_gps.class);
Intent intent2 = new Intent(activity_unterkunft.this, MapsActivity.class);
startActivity(intent2);
}
if(v.getId()==R.id.btnGallery){
openGallery();
}
}
private void openGallery() {
Intent Gallery = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(Gallery, PICK_IMAGE);
}
private String getPictureName() {
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd_HHmmss");
String timestamp = sdf.format(new Date());
return "Rechnung"+ timestamp + ".jpg";
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(resultCode==RESULT_OK && requestCode==PICK_IMAGE){
imageUri= data.getData();
imageView6.setImageURI(imageUri);
}
// Bitmap bitmap = (Bitmap)data.getExtras().get("data");
//imageView.setImageBitmap(bitmap);
}
/**
* Function to load the spinner data from SQLite database
* */
private void loadSpinnerData() {
// database handler
DatabaseHelper db = new DatabaseHelper (getApplicationContext());
// Spinner Drop down elements
List<String> projects = db.getAllProjects();
// Creating adapter for spinner
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, projects);
// Drop down layout style - list view with radio button
dataAdapter
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
ChooseProject.setPrompt("Projekt auswählen");
// attaching data adapter to spinner
ChooseProject.setAdapter(dataAdapter);
//Listener für den Spinner damit ich den Wert abspeichern kann
ChooseProject.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
//selectedspinner =String.ValueOf(parent.getItemAtPosition(pos));
selectedspinner = (String) ChooseProject.getSelectedItem();
}
public void onNothingSelected(AdapterView<?> parent) {
}
});
}
public static byte[] imageViewToByte(ImageView image) {
Bitmap bitmap = ((BitmapDrawable)image.getDrawable()).getBitmap();
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();
return byteArray;
}
//++++++++++++Save Data++++++//
public void SaveData(){
btn_save.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
boolean isInserted = myDb.createUnterkunft(
selectedspinner,
Integer.valueOf(Price.getText().toString()),
Integer.valueOf(MWST.getText().toString()),
Integer.valueOf(Entfernung.getText().toString()),
imageViewToByte(imageView6)
);
if(isInserted=true)
Toast.makeText(activity_unterkunft.this, "Daten gespeichert", Toast.LENGTH_LONG).show();
else
Toast.makeText(activity_unterkunft.this, "Daten nicht gespeichert", Toast.LENGTH_LONG).show();
}
}
);
}
}
在我的DB-助手相应的方法：
//+++++++++++++CREATE A UNTERKUNFT++++++++++++//
public boolean createUnterkunft(String project, int price, int steuer, int entfernung, byte [] image){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(KEY_PROJECT, project);
contentValues.put(KEY_PRICE, price);
contentValues.put(KEY_MWST, steuer);
contentValues.put(KEY_ENTFERNUNG, entfernung);
contentValues.put(KEY_RECHNUNG_IMG, image);
long result = db.insert(TABLE_UNTERKUNFT,null,contentValues);
if(result == -1)
return false;
else
return true;
}
我希望有人能帮助我解决这个问题。
'（BitmapDrawable）image.getDrawable（）'返回'null'。你可能需要看看你的'myDb.createUnterkunft'方法 – GuilhermeFGL
，但这是什么意思？ – Stelios
我忘了添加错误消息的第一部分 – Stelios