我的应用程序从相机拍摄照片并将其显示给另一个活动。此外，还需要从Firebase存储和检索数据。
但是，在拍摄照片后应用程序崩溃并从相机中单击“确定”。 此外，我没有得到log cat异常。该怎么办？ //以下是调用摄像机的活动：
public class HomeActivity extends AppCompatActivity {
private SectionsPagerAdapter mSectionsPagerAdapter;
private static final int CAMERA_REQUEST = 1888;
private ViewPager mViewPager;
private File imageFile;
private Uri imageUri;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
String timeStamp= new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName="IMAGE_"+timeStamp+"_";
//Adding Camera Intent when clicked on the FAB
@Override
public void onClick(View view) {
Intent cameraIntent=new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent,CAMERA_REQUEST);
}
});
}
//What Happens After the Image is Captured
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if(requestCode==CAMERA_REQUEST && resultCode==Activity.RESULT_OK){
Toast.makeText(this,"File saved to"+imageFile.getAbsolutePath(),Toast.LENGTH_LONG).show();
Intent intent=new Intent(HomeActivity.this,PostActivity.class);
Bitmap photo = (Bitmap) data.getExtras().get("data");
Uri uri=data.getData();
intent.putExtra("EXTRA_VALUE",photo);
intent.setData(uri);
startActivity(intent);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_home, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
switch (position){
case 0:
AllPosts allposts=new AllPosts();
return allposts;
case 1:
MyPosts myposts=new MyPosts();
return myposts;
default:
return null;
}
}
@Override
public int getCount() {
// Show 2 total pages.
return 2;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "All Posts";
case 1:
return "My Posts";
}
return null;
}
}
}
以下是图像应在imageview中显示的代码
public class PostActivity extends Activity {
private ImageButton mImageSelect;
private EditText postTitle;
private EditText postDescription;
private Button submitButton;
private TextView changeImage;
private Uri imageUri=null;
private StorageReference storage;
private ProgressDialog progressDialogue;
private DatabaseReference database;
public String titleVal;
public String descriptionVal;
private ImageView mImageView;
private static final int GALLERY_REQUEST=1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_post);
storage= FirebaseStorage.getInstance().getReference();
database= FirebaseDatabase.getInstance().getReference().child("Posts");
mImageView=(ImageView) findViewById(R.id.imageView);
postTitle=(EditText) findViewById(R.id.titleField);
postDescription=(EditText)findViewById(R.id.descriptionField);
submitButton=(Button) findViewById(R.id.submitPost);
progressDialogue=new ProgressDialog(this);
Intent intent=getIntent();
Bitmap bitmap = (Bitmap) intent.getParcelableExtra("EXTRA_VALUE");
imageUri=getIntent().getData();
mImageView.setImageBitmap(bitmap);
submitButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startPosting();
}
});
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putString("titleVal", titleVal);
outState.putString("descriptionVal",descriptionVal );
}
private void startPosting() {
titleVal=postTitle.getText().toString().trim();
descriptionVal=postDescription.getText().toString().trim();
if(!TextUtils.isEmpty(titleVal) && !TextUtils.isEmpty(descriptionVal) && imageUri!=null){
progressDialogue.setMessage("আপলোড হচ্ছে......");
progressDialogue.show();
StorageReference filePath=storage.child("post_images").child(imageUri.getLastPathSegment());
filePath.putFile(imageUri).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
Uri downloadUrl=taskSnapshot.getDownloadUrl();
Picasso.with(PostActivity.this).load(downloadUrl).into(mImageView);
DatabaseReference newPost=database.push();
newPost.child("title").setValue(titleVal);
newPost.child("description").setValue(descriptionVal);
newPost.child("image").setValue(downloadUrl.toString());
progressDialogue.dismiss();
Toast.makeText(getApplicationContext(), "Successfully Uploaded", Toast.LENGTH_LONG).show();
startActivity(new Intent(PostActivity.this,HomeActivity.class));
}
});
}else{
Toast.makeText(getApplicationContext(), "Please provide a Title", Toast.LENGTH_LONG).show();
}
}
}
答案 0 :(得分：0)
使用相机拍照时，您的数据始终为空。
尝试按以下方式开始活动：
Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
String path;
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
path = Environment.getExternalStorageDirectory() + "/appdir";
} else {
path = activity.getCacheDir() + "/appdir";
}
String filePath = path + "/image.jpg";
Uri imageUri = Uri.fromFile(new File(filePath));
intent.putExtra(MediaStore.EXTRA_OUTPUT, StaticStorage.selectedImageFromCamera);
activity.startActivityForResult(intent, requestCode);
在onActivityResult（）上，您可以从StaticStorage.selectedImageUri
答案 1 :(得分：0)
请尝试以下代码可能对您有所帮助。
首先声明一个变量
private static final int PICK_CAMERA_IMAGE = 2;
private Uri imageCaptureUri;
然后在按钮单击或onCreate（）
上添加以下代码Intent intent = new ntent(MediaStore.ACTION_IMAGE_CAPTURE);
File file = new File(Environment.getExternalStorageDirectory()
+ "/imgDirectory", "imgName"+ ".png");
imageCaptureUri= Uri.fromFile(file);
intent.putExtra(MediaStore.EXTRA_OUTPUT, imageCaptureUri);
startActivityForResult(intent, PICK_CAMERA_IMAGE);
并在onActivityResult中从imageCaptureUri获取图像并在imageview中显示图像。
if (resultCode == Activity.RESULT_OK) {
switch (requestCode) {
case PICK_CAMERA_IMAGE:
img.setImageURI(imageCaptureUri);
break;
}
}
如果要将URI从一个活动发送到另一个活动，可以使用intent发送此URI。 在onActivityResult中使用以下代码
Intent intent = new Intent(this, NewActivity.class);
intent.putExtra("imageUri", imageCaptureUri.toString());
startActivity(intent);
而不是
img.setImageURI(imageCaptureUri);.
然后在另一个活动中转换回这样的字符串，并将新创建的uri设置为imageview。
Uri newUri = Uri.parse(getIntent().getStringExtra("imageUri"));
ImageView img = (ImageView) findViewById(R.id.imageView);
img.setImageURI(newUri);