我正在尝试将 Android 应用程序中相机拍摄的图像上传到 Firebase 存储。问题是我拍照后在确认activity，我按下确认按钮，它显示“不幸的是，应用程序已停止”。
这是当我按下检查按钮时的图像，应用程序崩溃了......
这是我的代码，应用程序可以选择使用图库和相机上传图片。
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.storage.FirebaseStorage;
import com.google.firebase.storage.StorageReference;
import com.google.firebase.storage.UploadTask;
public class MainActivity extends AppCompatActivity {
// Note: Your consumer key and secret should be obfuscated in your source code before shipping.
private Button selectImage;
private Button selectImageByCamera;
private ImageView imageView;
private StorageReference storageReference;
private ProgressDialog progressDialog;
private static final int CAMERA_REQUEST_CODE = 1;
private static final int GALLERY_INTENT= 2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.content_main);
storageReference=FirebaseStorage.getInstance().getReference();
/*
* Code section to upload an image using the Gallery.
*/
selectImage=(Button)findViewById(R.id.btn_uploadImg);
progressDialog = new ProgressDialog(this);
selectImage.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View view)
{
Intent intent = new Intent(Intent.ACTION_PICK);
intent.setType("image/*");
startActivityForResult(intent, GALLERY_INTENT);
}
});
/*
* Code section to upload an image using the Camera.
*/
selectImageByCamera=(Button)findViewById(R.id.btn_uploadImgCamera);
imageView=(ImageView)findViewById(R.id.imageView);
selectImageByCamera.setOnClickListener(new View.OnClickListener()
{
public void onClick(View view)
{
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent, CAMERA_REQUEST_CODE);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
super.onActivityResult(requestCode,resultCode,data);
//Upload the image to Firebase Update
if(requestCode==GALLERY_INTENT && resultCode == RESULT_OK)
{
progressDialog.setMessage("Uploading Image...");
progressDialog.show();
Uri uri = data.getData();
StorageReference filepath = storageReference.child("Photos").child(uri.getLastPathSegment());
filepath.putFile(uri).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
Toast.makeText(MainActivity.this, "Upload done", Toast.LENGTH_LONG).show();
progressDialog.dismiss();
}
});
}
//Code to upload image taken by the camera to firebase storage
if(requestCode==CAMERA_REQUEST_CODE && resultCode == RESULT_OK)
{
progressDialog.setMessage("Uploading Image...");
progressDialog.show();
Uri uri2 = data.getData();
StorageReference filepath = storageReference.child("Photos").child(uri2.getLastPathSegment());
filepath.putFile(uri2).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
{
Toast.makeText(MainActivity.this, "Upload done", Toast.LENGTH_LONG).show();
progressDialog.dismiss();
}
}
});
}
}
@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);
}
}
我在 AndroidManifest.xml 中有这个用户权限：
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.CAMERA"/>
我在 app/build.gradle 中有这个 Firebase 依赖项
compile 'com.google.firebase:firebase-core:9.8.0'
compile 'com.google.firebase:firebase-database:9.8.0'
compile 'com.google.firebase:firebase-storage:9.8.0'
compile 'com.google.firebase:firebase-auth:9.8.0'
最后，这是我在 Moto G4 6.0.1 中运行该应用程序时抛出的异常（该应用程序有权使用相机和图库）
FATAL EXCEPTION: main
Process: mx.com.jamba.jamba, PID: 16543
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { act=inline-data (has extras) }} to activity {mx.com.jamba.jamba/mx.com.jamba.jamba.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.net.Uri.getLastPathSegment()' on a null object reference
at android.app.ActivityThread.deliverResults(ActivityThread.java:3720)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3763)
at android.app.ActivityThread.access$1400(ActivityThread.java:154)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1403)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5443)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.net.Uri.getLastPathSegment()' on a null object reference
at mx.com.jamba.jamba.MainActivity.onActivityResult(MainActivity.java:186)
at android.app.Activity.dispatchActivityResult(Activity.java:6470)
at android.app.ActivityThread.deliverResults(ActivityThread.java:3716)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3763)
at android.app.ActivityThread.access$1400(ActivityThread.java:154)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1403)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5443)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
我不知道该怎么办，如果你们能帮助我，那就太好了:) 谢谢你！
发生异常的原因是Uri in onActivityResult()一片空白：
Uri uri = data.getData();
捕获相机图像的文档解释：
Android 相机应用程序会保存一张全尺寸照片（如果您提供） 要保存到的文件。您必须提供完全限定的文件名 相机应用程序应将照片保存在何处.
按照文档中的示例创建文件 Uri 并将其添加到相机应用程序的意图中。