我正在将字符串转换为url，然后将url转换为位图以在AsynTask方法中的图像视图中设置图像。但是，当我调用AsyncTask方法时，它没有进入它并且应用程序崩溃与nullpointerexception.Where我犯了错误？请纠正我..非常感谢任何帮助。
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_contributor_profile);
contributorName = (TextView) findViewById(R.id.contributor_name);
androidOS = Build.VERSION.RELEASE;
device_uuid= Settings.Secure.getString(this.getContentResolver(), Settings.Secure.ANDROID_ID);
profile_pic = (ImageView) findViewById(R.id.profile_pic);
myChronometer = (Chronometer)findViewById(R.id.recordtime);
per = (TextView) findViewById(R.id.per);
statement = (EditText) findViewById(R.id.reason);
time = (EditText) findViewById(R.id.hours_count);
month_week = (Spinner) findViewById(R.id.weekmonth);
Bundle bun = getIntent().getExtras();
contributor_name = bun.getString("FIRST_NAME");
profile_id = bun.getString("P_ID");
profile_img = bun.getString("PROFILE_PIC");
profileImg = "https://www.thetagoreproject.org"+profile_img;
try {
URL url = new URL(profileImg);
} catch (MalformedURLException e) {
e.printStackTrace();
}
new BitmapAsyncTask().execute();
profile_pic.setImageBitmap(bitmap);
Log.d(TAG, " contributor_name Check :" + contributor_name);
Log.d(TAG, " profile_id Check :" + profile_id);
finished= (Button) findViewById(R.id.finished);
finished.setOnClickListener(this);
buttonStart = (ImageButton) findViewById(R.id.samplerecord);
buttonStart.setImageResource(R.mipmap.vs_sample_record);
buttonStop = (ImageButton) findViewById(R.id.stop);
buttonPlayLastRecordAudio = (ImageButton) findViewById(R.id.play);
buttonStopPlayingRecording = (ImageButton) findViewById(R.id.stopplay);
buttonStop.setEnabled(false);
buttonPlayLastRecordAudio.setEnabled(false);
buttonStopPlayingRecording.setEnabled(false);
contributorName.setText("Hey" +contributor_name);
//profile_pic.setImageBitmap(bitmap);
db = new SQLiteHandler(getApplicationContext());
random = new Random();
buttonStart.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(checkPermission()) {
AudioSavePathInDevice =
Environment.getExternalStorageDirectory().getAbsolutePath() + "/" +
CreateRandomAudioFileName(5) + "AudioRecording.mp3";
MediaRecorderReady();
try {
mediaRecorder.prepare();
mediaRecorder.start();
// mediaRecorder.setMaxDuration(6000);
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
buttonStart.setEnabled(false);
buttonStart.setVisibility(View.INVISIBLE);
buttonStop.setImageResource(R.mipmap.vs_sample_stoprecord);
buttonStop.setEnabled(true);
buttonStop.setVisibility(View.VISIBLE);
myChronometer.setBase(SystemClock.elapsedRealtime());
myChronometer.setVisibility(View.VISIBLE);
myChronometer.start();
Toast.makeText(ContributorProfile.this, "Recording started",
Toast.LENGTH_LONG).show();
} else {
requestPermission();
}
}
});
buttonStop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mediaRecorder.stop();
myChronometer.stop();
myChronometer.setVisibility(View.INVISIBLE);
buttonStop.setEnabled(false);
buttonStop.setVisibility(View.INVISIBLE);
buttonPlayLastRecordAudio.setEnabled(true);
buttonPlayLastRecordAudio.setVisibility(View.VISIBLE);
// buttonStart.setEnabled(true);
// buttonStart.setVisibility(View.VISIBLE);
// buttonStopPlayingRecording.setEnabled(false);
Toast.makeText(ContributorProfile.this, "Recording Completed",
Toast.LENGTH_LONG).show();
}
});
buttonPlayLastRecordAudio.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) throws IllegalArgumentException,
SecurityException, IllegalStateException {
// buttonStop.setEnabled(false);
// buttonStart.setEnabled(false);
buttonStopPlayingRecording.setEnabled(true);
buttonStopPlayingRecording.setVisibility(View.VISIBLE);
mediaPlayer = new MediaPlayer();
try {
mediaPlayer.setDataSource(AudioSavePathInDevice);
mediaPlayer.prepare();
} catch (IOException e) {
e.printStackTrace();
}
mediaPlayer.start();
Toast.makeText(ContributorProfile.this, "Recording Playing",
Toast.LENGTH_LONG).show();
}
});
buttonStopPlayingRecording.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// buttonStop.setEnabled(false);
buttonStart.setEnabled(true);
buttonStart.setVisibility(View.VISIBLE);
buttonStopPlayingRecording.setEnabled(false);
buttonStopPlayingRecording.setVisibility(View.INVISIBLE);
// buttonPlayLastRecordAudio.setEnabled(true);
if(mediaPlayer != null){
mediaPlayer.stop();
mediaPlayer.release();
MediaRecorderReady();
}
}
});
}
private class BitmapAsyncTask extends AsyncTask<Void,Void,Void> {
@Override
protected Void doInBackground(Void... params) {
getBitmapFromURL(profileImg);
return null;
}
}
public Bitmap getBitmapFromURL(String src) {
try {
URL url = new URL(src);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream input = connection.getInputStream();
bitmap = BitmapFactory.decodeStream(input);
return bitmap;
} catch (IOException e) {
// Log exception
return null;
}
}
@Override
public void onClick(View v) {
if (v == finished) {
String tag_string_req = "req_login";
StringRequest postStringRequest = new StringRequest(Request.Method.POST, SC_LOGIN_LINK,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.d(TAG, "Reponse Check for sound upload login :" + response);
// Log.d(TAG,"Object Check :"+json);
try {
JSONObject json = new JSONObject(response);
access_token = json.getString("access_token");
expires_in = json.getString("expires_in");
refresh_token = json.getString("refresh_token");
// doFileUpload();
new AsyncTaskRunner().execute();
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
//Toast.makeText(AccessToken.this, error.toString(), Toast.LENGTH_LONG).show();
Log.e(TAG, "Error Response Check :" + error);
}
}) {
@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
params.put("client_id", client_id);
params.put("client_secret", client_secret);
params.put("grant_type", grant_type);
params.put("username", username);
params.put("password", user_password);
Log.d(TAG, "Params :" + params);
return params;
}
};
//how to do tht??
AppController.getInstance().addToRequestQueue(postStringRequest, tag_string_req);
// ContributorsProfile();
// forwardtoOurServer();
Intent i = new Intent(ContributorProfile.this, Categories.class);
startActivity(i);
// UploadAudio();
}
// }else if(v==buttonUpload){
// accesstoken.checkLogin();//yahan pe call lr rhe h....nd isk ajo v response aa rha h...uska value isi class me chahiye...
}
public byte[] toByteArray(InputStream in) throws IOException {
ByteArrayOutputStream out = new ByteArrayOutputStream();
int read = 0;
byte[] buffer = new byte[1024];
while (read != -1) {
read = in.read(buffer);
if (read != -1)
out.write(buffer,0,read);
}
out.close();
return out.toByteArray();
}
public void forwardtoOurServer() {
final String statemnt = statement.getText().toString().trim();
String tag_string_req = "req_login";
StringRequest postStringRequest = new StringRequest(Request.Method.POST, CONTRIBUTORPROFILE_API,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.d(TAG, "Audio Upload Response Check :" + response);
Log.d(TAG,"Object Check :"+response);
try {
JSONObject json = new JSONObject(response).getJSONObject("contributor").getJSONObject("Contributor");
contributor_id = json.getString("id");
String profile_id = json.getString("profile_id");
String secret_token = json.getString("secret_token");
String statement = json.getString("statement");
String status = json.getString("status");
String time = json.getString("time");
String uploaded_on = json.getString("uploaded_on");
String vs_cdn_id = json.getString("vs_cdn_id");
String created = json.getString("created");
String modified = json.getString("modified");
contributor_id = json.getString("id");
session.addContributorSession(contributor_id);
db.addContributor(contributor_id, profile_id, secret_token, statement, status, time, uploaded_on, vs_cdn_id, created, modified);
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e(TAG, "Error Response Check :" + error);
}
}) {
@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
params.put("data[Contributor][statement]",statemnt);
params.put("data[Contributor][profile_id]",profile_id);
params.put("data[Contributor][status]","1");
params.put("data[Contributor][secret_token]",secret_token);
params.put("data[Contributor][vs_cdn_id]",vs_cdn_id);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
sdf.setTimeZone(TimeZone.getTimeZone("GMT"));
Date now = new Date();
String strDate = sdf.format(now);
params.put("data[Contributor][uploaded_on]",strDate);
//params.put("data[Contributor][time]",hours+" hours "+"per "+months);
// params.put("password", user_password);
Log.d(TAG, "Params :" + params);
return params;
}
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String, String> headers = new HashMap<String, String>();
headers.put("Content-Type", "application/x-www-form-urlencoded");
headers.put("UUID", device_uuid);
headers.put("APPID", "2A192A0C22");
headers.put("USERID", "1");
headers.put("PLATFORM", "Andriod");
headers.put("APP_REQUEST", "1");
headers.put("PLATFORMVERSION",androidOS);
return headers;
}
};
AppController.getInstance().addToRequestQueue(postStringRequest, tag_string_req);
}
public void MediaRecorderReady(){
mediaRecorder=new MediaRecorder();
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
mediaRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB);
mediaRecorder.setOutputFile(AudioSavePathInDevice);
}
public String CreateRandomAudioFileName(int string){
StringBuilder stringBuilder = new StringBuilder( string );
int i = 0 ;
while(i < string ) {
stringBuilder.append(RandomAudioFileName.
charAt(random.nextInt(RandomAudioFileName.length())));
i++ ;
}
return stringBuilder.toString();
}
private void requestPermission() {
ActivityCompat.requestPermissions(ContributorProfile.this, new
String[]{WRITE_EXTERNAL_STORAGE, RECORD_AUDIO}, RequestPermissionCode);
}
@Override
public void onRequestPermissionsResult(int requestCode,String permissions[], int[] grantResults) {
switch (requestCode) {
case RequestPermissionCode:
if (grantResults.length> 0) {
boolean StoragePermission = grantResults[0] ==
PackageManager.PERMISSION_GRANTED;
boolean RecordPermission = grantResults[1] ==
PackageManager.PERMISSION_GRANTED;
if (StoragePermission && RecordPermission) {
Toast.makeText(ContributorProfile.this, "Permission Granted",
Toast.LENGTH_LONG).show();
} else {
Toast.makeText(ContributorProfile.this,"Permission Denied",Toast.LENGTH_LONG).show();
}
}
break;
}
}
public boolean checkPermission() {
int result = ContextCompat.checkSelfPermission(getApplicationContext(),
WRITE_EXTERNAL_STORAGE);
int result1 = ContextCompat.checkSelfPermission(getApplicationContext(),
RECORD_AUDIO);
return result == PackageManager.PERMISSION_GRANTED &&
result1 == PackageManager.PERMISSION_GRANTED;
}
private class AsyncTaskRunner extends AsyncTask<String,Void,String> {
@Override
protected String doInBackground(String... params) {
doFileUpload();
return null;
}
}
这是我的RoundedImageView.java 并且在RoundedImageview类的这一行中出现nullpointerexception＆＃34; Bitmap bitmap = b.copy（Bitmap.Config.ARGB_8888，true）;＆＃34;
public class RoundedImageView extends android.support.v7.widget.AppCompatImageView{
public RoundedImageView(Context ctx, AttributeSet attrs) {
super(ctx, attrs);
}
@Override
protected void onDraw(Canvas canvas) {
Drawable drawable = getDrawable();
if (drawable == null) {
return;
}
if (getWidth() == 0 || getHeight() == 0) {
return;
}
Bitmap b = ((BitmapDrawable) drawable).getBitmap();
Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);
int w = getWidth(), h = getHeight();
Bitmap roundBitmap = getRoundedCroppedBitmap(bitmap, w);
canvas.drawBitmap(roundBitmap, 0, 0, null);
}
public static Bitmap getRoundedCroppedBitmap(Bitmap bitmap, int radius) {
Bitmap finalBitmap;
if (bitmap.getWidth() != radius || bitmap.getHeight() != radius)
finalBitmap = Bitmap.createScaledBitmap(bitmap, radius, radius,
false);
else
finalBitmap = bitmap;
Bitmap output = Bitmap.createBitmap(finalBitmap.getWidth(),
finalBitmap.getHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, finalBitmap.getWidth(),
finalBitmap.getHeight());
paint.setAntiAlias(true);
paint.setFilterBitmap(true);
paint.setDither(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(Color.parseColor("#BAB399"));
canvas.drawCircle(finalBitmap.getWidth() / 2 + 0.7f,
finalBitmap.getHeight() / 2 + 0.7f,
finalBitmap.getWidth() / 2 + 0.1f, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(finalBitmap, rect, rect, paint);
return output;
}
日志：
05-24 12:33:45.838 29693-29693/com.showhow2.www.thetagoreproject D/AndroidRuntime: Shutting down VM
05-24 12:33:45.839 29693-29693/com.showhow2.www.thetagoreproject E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.showhow2.www.thetagoreproject, PID: 29693
java.lang.NullPointerException: Attempt to invoke virtual method 'android.graphics.Bitmap android.graphics.Bitmap.copy(android.graphics.Bitmap$Config, boolean)' on a null object reference
at com.showhow2.www.thetagoreproject.RoundedImageView.onDraw(RoundedImageView.java:38)
at android.view.View.draw(View.java:16184)
at android.view.View.updateDisplayListIfDirty(View.java:15180)
at android.view.View.draw(View.java:15954)
at android.view.ViewGroup.drawChild(ViewGroup.java:3609)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3399)
at android.view.View.updateDisplayListIfDirty(View.java:15175)
at android.view.View.draw(View.java:15954)
at android.view.ViewGroup.drawChild(ViewGroup.java:3609)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3399)
at android.view.View.draw(View.java:16187)
at android.widget.ScrollView.draw(ScrollView.java:1712)
at android.view.View.updateDisplayListIfDirty(View.java:15180)
at android.view.View.draw(View.java:15954)
at android.view.ViewGroup.drawChild(ViewGroup.java:3609)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3399)
at android.view.View.updateDisplayListIfDirty(View.java:15175)
at android.view.View.draw(View.java:15954)
at android.view.ViewGroup.drawChild(ViewGroup.java:3609)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3399)
at android.view.View.updateDisplayListIfDirty(View.java:15175)
at android.view.View.draw(View.java:15954)
at android.view.ViewGroup.drawChild(ViewGroup.java:3609)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3399)
at android.view.View.draw(View.java:16187)
at com.android.internal.policy.PhoneWindow$DecorView.draw(PhoneWindow.java:2690)
at android.view.View.updateDisplayListIfDirty(View.java:15180)
at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:281)
at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:287)
at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:322)
at android.view.ViewRootImpl.draw(ViewRootImpl.java:2615)
at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2434)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2067)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1107)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6013)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858)
at android.view.Choreographer.doCallbacks(Choreographer.java:670)
at android.view.Choreographer.doFrame(Choreographer.java:606)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
05-24 12:38:45.892 29693-29693/com.showhow2.www.thetagoreproject I/Process: Sending signal. PID: 29693 SIG: 9
答案 0 :(得分：1)
使用此方法将drawable转换为位图：
public static Bitmap drawableToBitmap (Drawable drawable){
Bitmap bitmap = null;
if (drawable instanceof BitmapDrawable) {
BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;
if (bitmapDrawable.getBitmap() != null) {
return bitmapDrawable.getBitmap();
}
}
if (drawable.getIntrinsicWidth() <= 0 || drawable.getIntrinsicHeight() <= 0) {
bitmap = Bitmap.createBitmap(1, 1, Bitmap.Config.ARGB_8888); // Single color bitmap will be created of 1x1 pixel
} else {
bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
}
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
drawable.draw(canvas);
return bitmap;
}
然后代替在原始代码中使用以下行：
Bitmap b = ((BitmapDrawable) drawable).getBitmap();
请改用：
Bitmap b = drawableToBitmap(drawable);