私の友人と私は、カメラアプリを使用して写真を撮り、その写真を API にアップロードする Android アプリを作成しようとしています。私たちはどちらも Android をやったことがありませんが、私の友人は Java の経験があります。私はまったくの初心者です。カメラ部分とアップロード部分を別々に作成しましたが、どちらも機能しました。今、私の友人は 1 週間不在で、私は 2 つの部分を 1 つのアプリにまとめようとしています。残念ながら、アプリは起動時にクラッシュします。
編集: TVS を OnCreate に移動しました。
これが私のコードです：
public class Main extends Activity implements OnClickListener {
//private static final String STATE_SCORE = null;
//private static final String STATE_LEVEL = null;
int mCurrentScore;
int mCurrentLevel;
InputStream is;
static String message="notnull";
TextView tv;
TextView tvs;
static int i=0;
private static final int TAKE_PICTURE = 0;
private Uri mUri;
private Bitmap mPhoto;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
subclass sub= new subclass();
sub.execute();
setContentView(R.layout.activity_main);
((Button) findViewById(R.id.cam)).setOnClickListener(this);
tvs=(TextView)findViewById(R.id.textie);
//if(i<0)
tvs.setText(message);
}
@Override
public void onClick(View view) {
if (view.getId()== R.id.cam) {
Intent i = new Intent("android.media.action.IMAGE_CAPTURE");
File f = new File(Environment.getExternalStorageDirectory(), "photo.jpg");
i.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f));
mUri = Uri.fromFile(f);
startActivityForResult(i, TAKE_PICTURE);
}
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK) {
getContentResolver().notifyChange(mUri, null);
ContentResolver cr = getContentResolver();
try {
mPhoto = android.provider.MediaStore.Images.Media.getBitmap(cr, mUri);
((ImageView)findViewById(R.id.photo_holder)).setImageBitmap(mPhoto);
}
catch (Exception e) {
Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show();
}
}
}
/* @Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
tvs=(TextView)findViewById(R.id.textie);
//if(i<0)
tvs.setText(message);
getMenuInflater().inflate(R.menu.main, menu);
return true;
}*/
public void start(View view){
disp();
}
//display converted string in textView
public void disp(){
tv=(TextView)findViewById(R.id.textie);
tv.setText(message);
tv.invalidate();
i++;
}
private class subclass extends AsyncTask<Object, Object, Object>{
@Override
protected Object doInBackground(Object... arg0) {
//create bitmap
Bitmap bitmapOrg = BitmapFactory.decodeFile("photo.jpg");
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmapOrg.compress(Bitmap.CompressFormat.JPEG, 90, baos);
byte [] ba = baos.toByteArray();
//encode bytes
int flag = 0;
String ba1 = Base64.encodeToString(ba, flag);
ArrayList<BasicNameValuePair> nameValuePairs = new ArrayList<BasicNameValuePair>();
nameValuePairs.add(new BasicNameValuePair("image",ba1));
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://url.placeholder.com");
try{
//upload bytes
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
//handle response
HttpEntity entity = response.getEntity();
is = (InputStream) entity.getContent();
//convert to string
message=convertStreamToString(is);
}
catch(Exception e){
Log.e("log_tag", "Error in http connection "+e.toString());
}
return null;
}
public String convertStreamToString(java.io.InputStream is) {
java.util.Scanner s = new java.util.Scanner(is).useDelimiter("\\A");
return s.hasNext() ? s.next() : "";
}
}
}
そして私のエラーログは言う
07-30 11:50:13.531: W/dalvikvm(8865): threadid=11: thread exiting with uncaught exception (group=0x40a9ba08)
07-30 11:50:13.541: D/AndroidRuntime(8865): Shutting down VM
07-30 11:50:13.541: W/dalvikvm(8865): threadid=1: thread exiting with uncaught exception (group=0x40a9ba08)
07-30 11:50:13.541: E/AndroidRuntime(8865): FATAL EXCEPTION: AsyncTask #1
07-30 11:50:13.541: E/AndroidRuntime(8865): java.lang.RuntimeException: An error occured while executing doInBackground()
07-30 11:50:13.541: E/AndroidRuntime(8865): at android.os.AsyncTask$3.done(AsyncTask.java:278)
07-30 11:50:13.541: E/AndroidRuntime(8865): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
07-30 11:50:13.541: E/AndroidRuntime(8865): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
07-30 11:50:13.541: E/AndroidRuntime(8865): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
07-30 11:50:13.541: E/AndroidRuntime(8865): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
07-30 11:50:13.541: E/AndroidRuntime(8865): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
07-30 11:50:13.541: E/AndroidRuntime(8865): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
07-30 11:50:13.541: E/AndroidRuntime(8865): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
07-30 11:50:13.541: E/AndroidRuntime(8865): at java.lang.Thread.run(Thread.java:864)
07-30 11:50:13.541: E/AndroidRuntime(8865): Caused by: java.lang.NullPointerException
07-30 11:50:13.541: E/AndroidRuntime(8865): at com.example.cameraupload.Main$subclass.doInBackground(Main.java:118)
07-30 11:50:13.541: E/AndroidRuntime(8865): at android.os.AsyncTask$2.call(AsyncTask.java:264)
07-30 11:50:13.541: E/AndroidRuntime(8865): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
07-30 11:50:13.541: E/AndroidRuntime(8865): ... 5 more
07-30 11:50:13.551: D/Process(8865): killProcess, pid=8865
07-30 11:50:13.551: D/Process(8865): dalvik.system.VMStack.getThreadStackTrace(Native Method)
07-30 11:50:13.551: D/Process(8865): java.lang.Thread.getStackTrace(Thread.java:599)
07-30 11:50:13.551: D/Process(8865): android.os.Process.killProcess(Process.java:807)
07-30 11:50:13.551: D/Process(8865): com.android.internal.os.RuntimeInit$UncaughtHandler.uncaughtException(RuntimeInit.java:104)
07-30 11:50:13.551: D/Process(8865): java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:693)
07-30 11:50:13.551: D/Process(8865): java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:690)