我有两个图像按钮，一个用于从图库中拍摄照片并在另一个活动中显示。这很好用。它以高质量显示照片。但是当我尝试从相机拍摄照片然后将该照片显示在另一个活动中时，它会显示错误。这是我的代码 MainActivity.java：
private static final int REQUEST_CAMERA = 1;
private static int SELECT_FILE = 1;
public static Uri selectedImageURI;
if (take_photo != null) {
take_photo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent,REQUEST_CAMERA);
}
});
}
//to get the photo from gallery
if (get_photo != null) {
get_photo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(Intent.ACTION_PICK,MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i,SELECT_FILE);
}
if (resultCode == RESULT_OK) {
if (requestCode == SELECT_FILE) {
selectedImageURI = data.getData();
File imageFile = new File(getRealPathFromURI(selectedImageURI));
Intent intent = new Intent(this, ShowPhotoActivity.class);
intent.putExtra("imagePath", imageFile.toString());
startActivity(intent);}
else if (requestCode != RESULT_CANCELED)
{
if(requestCode == REQUEST_CAMERA){
Uri selectImageURI = data.getData();
File imgFile = new File(getRealPathFromURI(selectImageURI));
Intent i = new Intent(this,ShowPhotoActivity.class);
i.putExtra("imagePath",imgFile.toString());
startActivity(i);
}
} }}
private String getRealPathFromURI(Uri contentURI){
String result;
Cursor cursor = getContentResolver().query(contentURI,null,null,null,null);
if(cursor == null){
result = contentURI.getPath();
}else {
cursor.moveToFirst();
int idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
result = cursor.getString(idx);
cursor.close();
}
return result;
}
showPhotoActivity.java：
String image_path = getIntent().getStringExtra("imagePath");
Bundle extras = getIntent().getExtras();
Uri uri = Uri.parse(extras.getString("imagePath"));
if (showPhoto != null) {
Bitmap bm = BitmapFactory.decodeFile(uri.getPath());
showPhoto.setImageBitmap(bm);
}
的manifest.xml
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-feature android:name="android.hardware.camera" />
logcat的：
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { act=inline-data (has extras) }} to activity {com.example.gentaliu.photoeditor/com.example.gentaliu.photoeditor.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.net.Uri.getScheme()' on a null object reference
at android.app.ActivityThread.deliverResults(ActivityThread.java:3840)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3883)
at android.app.ActivityThread.access$1700(ActivityThread.java:165)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1426)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5593)
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:960)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.net.Uri.getScheme()' on a null object reference
at android.content.ContentResolver.acquireUnstableProvider(ContentResolver.java:1477)
at android.content.ContentResolver.query(ContentResolver.java:473)
at android.content.ContentResolver.query(ContentResolver.java:426)
at com.example.ga.photoeditor.MainActivity.getRealPathFromURI(MainActivity.java:96)
at com.example.ga.photoeditor.MainActivity.onActivityResult(MainActivity.java:69)
at android.app.Activity.dispatchActivityResult(Activity.java:6320)
at android.app.ActivityThread.deliverResults(ActivityThread.java:3836)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3883)
at android.app.ActivityThread.access$1700(ActivityThread.java:165)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1426)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5593)
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:960)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
09-16 00：46：51.149 27066-27066 / com.example.ga.photoeditor I / Process：发送信号。 PID：27066 SIG：9
答案 0 :(得分：0)
private static final int REQUEST_CAMERA = 1;
private static int SELECT_FILE = 1;
public static Uri selectedImageURI;
if (take_photo != null) {
take_photo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent,REQUEST_CAMERA);
}
});
}
//to get the photo from gallery
if (get_photo != null) {
get_photo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(Intent.ACTION_PICK,MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i,SELECT_FILE);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK) {
if (requestCode == SELECT_FILE) {
selectedImageURI = data.getData();
File imageFile = new File(getRealPathFromURI(selectedImageURI));
Intent intent = new Intent(this, ShowPhotoActivity.class);
intent.putExtra("imagePath", imageFile.toString());
startActivity(intent);
}
else if(requestCode == REQUEST_CAMERA){
Bitmap bitmapImage = (Bitmap) intent.getExtras().get("data");
Intent i= new Intent(this,ShowPhotoActivity.class);
i.putExtra("bitmap", bitmapImage);
startActivity(i);
}else{
//do something
}
}
private String getRealPathFromURI(Uri contentURI){
String result;
Cursor cursor = getContentResolver().query(contentURI,null,null,null,null);
if(cursor == null){
result = contentURI.getPath();
}else {
cursor.moveToFirst();
int idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
result = cursor.getString(idx);
cursor.close();
}
return result;
}
在第二个活动中检索相机的位图图像：
private void getData(){
Intent intent = getIntent();
Bitmap bitmap = (Bitmap) intent.getParcelableExtra("Bitmap");
img.setImageBitmap(bitmap);
}