我是一个新的程序员。我见过很多的教程,但不明白什么是错的。我想创建一个异步任务进度。然而,它总是崩溃我的应用程序。
下面是主的应用程序:
包pt.flag.ensemble; 导入了java.util.Random; 进口pt.flag.ensemble.task.AsyncTaskBar; 进口android.app.Activity; 进口android.content.Context; 进口android.content.Intent; 进口android.content.Shared preferences; 进口android.media.MediaPlayer; 进口android.os.Bundle; 进口android.view.Menu; 进口android.view.MenuItem; 进口android.view.View; 进口android.widget.Button; 进口android.widget.ImageButton; 进口android.widget.ProgressBar; 进口android.widget.Toast; 公共类间隔延伸活动{ 私有静态间隔实例; 私人上下文的背景下; 私人字符串的答案; INT right_question; INT wrong_question; INT randomInt2; 公共进度的进度; @覆盖 保护无效的onCreate(包savedInstanceState){ super.onCreate(savedInstanceState); 的setContentView(R.layout.activity_intervals); //初始化声音 最后的MediaPlayer Sound1例子= MediaPlayer.create(Intervals.this, R.raw.maj2); 最后的MediaPlayer SOUND2 = MediaPlayer.create(Intervals.this, R.raw.maj3); 最后的MediaPlayer sound3 = MediaPlayer.create(Intervals.this, R.raw.maj4); //进度条 例如=这一点; 进度进度=(进度)findViewById(R.id.Progressbar); progressBar.setProgress(0); //播放方法 最后的ImageButton播放=(的ImageButton)findViewById(R.id.Play); Play.setOnClickListener(新View.OnClickListener(){ @覆盖 公共无效的onClick(视图查看){ 新AsyncTaskBar()执行()。 Play.setEnabled(假); //生成随机数 随机randomGenerator =新的随机(); INT randomInt = randomGenerator.nextInt(3)+ 1; randomInt2 = randomInt; //选择合适的音效播放 开关(randomInt){ 情况1: sound1.start(); 回答=M2; 打破; 案例2: sound2.start(); 回答=M3; 打破; 案例3: sound3.start(); 回答=P4; 打破; } } }); //音频重复方法 按钮重复=(按钮)findViewById(R.id.Repeat); Repeat.setOnClickListener(新View.OnClickListener(){ @覆盖 公共无效的onClick(视图查看){ //选择合适的音效播放 开关(randomInt2){ 情况1: sound1.start(); 新AsyncTaskBar()执行()。 回答=M2; 打破; 案例2: sound2.start(); 新AsyncTaskBar()执行()。 回答=M3; 打破; 案例3: sound3.start(); 新AsyncTaskBar()执行()。 回答=P4; 打破; } } }); } //回答方法 公共无效buttonClicked2(查看视图){ 按钮clickedButton =(按钮)视图; 如果(clickedButton.getText()的toString()。等于(答案)){ Toast.makeText(Intervals.this,你说得对!,Toast.LENGTH_LONG) 。显示(); right_question = right_question + 1; 最后的ImageButton播放=(的ImageButton)findViewById(R.id.Play); Play.setEnabled(真正的); //通过结果 共享preferences共享preF = getShared preferences( INTERVALRIGHTS,Context.MODE_PRIVATE); 共享preferences.Editor编辑=共享pref.edit(); editor.putInt(分数,right_question); editormit(); } 其他 { Toast.makeText(Intervals.this,你错了!,Toast.LENGTH_LONG) 。显示(); wrong_question = wrong_question + 1; //通过结果 共享preferences共享preF02 = getShared preferences( INTERVALWRONGS,Context.MODE_PRIVATE); 共享preferences.Editor编辑=共享pref02.edit(); editor.putInt(SCORE02,wrong_question); editormit(); } } @覆盖 公共布尔onCreateOptionsMenu(功能菜单){ //充气菜单;这增加了项目操作栏,如果它是present。 。getMenuInflater()膨胀(R.menu.intervals,菜单); 返回true; } @覆盖 公共布尔onOptionsItemSelected(菜单项项){ //处理动作栏项目点击这里。将操作栏 //自动在主/向上按钮操作的点击,只要 //你在AndroidManifest.xml中指定一个父活动。 开关(item.getItemId()){ 案例R.id.action_settings: 意向意图=新的意图(Intervals.this,IntervalResults.class); startActivity(意向); 打破; 默认: 返回super.onOptionsItemSelected(项目); } 返回true; } 公共静态间隔getApp(){返回实例; } }下面是AsyncTask的类
包pt.flag.eventapp.task; 进口pt.flag.eventapp.Main; 进口android.os.AsyncTask; 进口android.os.SystemClock; 进口android.widget.Toast; 公共类ShowDialogAsyncTask扩展的AsyncTask<太虚,整型,太虚> { INT progress_status; @覆盖 在preExecute保护无效(){ // TODO自动生成方法存根 super.on preExecute(); //Toast.makeText(Main.getApp(),"Invoke在preExecute(),Toast.LENGTH_SHORT).show(); progress_status = 0; //Main.getApp().txt_percentage.setText("downloading 0%); } @覆盖 保护无效doInBackground(虚空...... PARAMS){ 而(progress_status< 100){ progress_status + = 2; publishProgress(progress_status); SystemClock.sleep(300); } 返回null; } @覆盖 保护无效onProgressUpdate(整数...值){ super.onProgressUpdate(值); //Main.getApp().progressBar.setProgress(values[0]); //Main.getApp().txt_percentage.setText("downloading+值[0] +%); } @覆盖 保护无效onPostExecute(无效的结果){ super.onPostExecute(结果); //Toast.makeText(Main.getApp(),调用onPostExecute(),Toast.LENGTH_SHORT).show(); //Main.getApp().txt_percentage.setText("download完成); } }下面是日志:
08-10 20:38:11.081:E / AndroidRuntime(21441):致命异常:主要 08-10 20:38:11.081:E / AndroidRuntime(21441):显示java.lang.NullPointerException 08-10 20:38:11.081:E / AndroidRuntime(21441):在pt.flag.ensemble.task.AsyncTaskBar.onProgressUpdate(AsyncTaskBar.java:34) 08-10 20:38:11.081:E / AndroidRuntime(21441):在pt.flag.ensemble.task.AsyncTaskBar.onProgressUpdate(AsyncTaskBar.java:1) 08-10 20:38:11.081:E / AndroidRuntime(21441):在android.os.AsyncTask $ InternalHandler.handleMessage(AsyncTask.java:618) 08-10 20:38:11.081:E / AndroidRuntime(21441):在android.os.Handler.dispatchMessage(Handler.java:99) 08-10 20:38:11.081:E / AndroidRuntime(21441):在android.os.Looper.loop(Looper.java:156) 08-10 20:38:11.081:E / AndroidRuntime(21441):在android.app.ActivityThread.main(ActivityThread.java:4977) 08-10 20:38:11.081:E / AndroidRuntime(21441):在java.lang.reflect.Method.invokeNative(本机方法) 08-10 20:38:11.081:E / AndroidRuntime(21441):在java.lang.reflect.Method.invoke(Method.java:511) 08-10 20:38:11.081:E / AndroidRuntime(21441):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:784) 08-10 20:38:11.081:E / AndroidRuntime(21441):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 08-10 20:38:11.081:E / AndroidRuntime(21441):在dalvik.system.NativeStart.main(本机方法)如果我是正确的,日志似乎表明在线路34处的AsyncTask类的错误,这是Intervals.getApp()progressBar.setProgress(数值[0]);。我只是不知道为什么...
此外,这里是我的xml文件
< XML版本=1.0编码=UTF-8&GT?; < RelativeLayout的的xmlns:机器人=http://schemas.android/apk/res/android 机器人:layout_width =FILL_PARENT 机器人:layout_height =FILL_PARENT> <的ImageButton 机器人:ID =@ + ID /播放 机器人:contentDescription =@字符串/参考hello world 机器人:layout_width =WRAP_CONTENT 机器人:layout_height =WRAP_CONTENT 机器人:SRC =@可绘制/ ic_launcher 机器人:layout_marginTop =50dp 机器人:layout_marginLeft =50dp/> <按钮 机器人:ID =@ + ID /重复 机器人:contentDescription =@字符串/参考hello world 机器人:layout_width =WRAP_CONTENT 机器人:layout_height =WRAP_CONTENT 机器人:文本=重复 机器人:layout_marginTop =50dp 机器人:layout_toRightOf =@ + ID /播放 机器人:layout_marginLeft =25dp/> <进度 机器人:ID =@ + ID /进度 风格=@安卓风格/ Widget.ProgressBar.Horizontal 机器人:layout_width =FILL_PARENT 机器人:layout_height =WRAP_CONTENT 机器人:文本=测试 机器人:layout_marginTop =20dp 机器人:layout_below =@ + ID /播放/> <按钮 机器人:ID =@ + ID / Octave_Button 机器人:layout_width =52dp 机器人:layout_height =80dp 机器人:layout_marginLeft =5DP 机器人:layout_below =@ + ID /进度 机器人:的onClick =buttonClicked2 机器人:layout_marginTop =100dp 机器人:文本=@字符串/八度/> <按钮 机器人:ID =@ + ID / min2_Button 机器人:layout_width =52dp 机器人:layout_height =80dp 机器人:layout_below =@ + ID /进度 机器人:的onClick =buttonClicked2 机器人:layout_marginTop =100dp 机器人:layout_toRightOf =@ + ID / Octave_Button 机器人:文本=@字符串/ minor2/> <按钮 机器人:ID =@ + ID / Maj2_Button 机器人:layout_width =52dp 机器人:layout_height =80dp 机器人:layout_below =@ + ID /进度 机器人:的onClick =buttonClicked2 机器人:layout_marginTop =100dp 机器人:layout_toRightOf =@ + ID / min2_Button 机器人:文本=@字符串/ major2/> <按钮 机器人:ID =@ + ID / min3_Button 机器人:layout_width =52dp 机器人:layout_height =80dp 机器人:layout_below =@ + ID /进度 机器人:的onClick =buttonClicked2 机器人:layout_marginTop =100dp 机器人:layout_toRightOf =@ + ID / Maj2_Button 机器人:文本=@字符串/ minor3/> <按钮 机器人:ID =@ + ID / Maj3_Button 机器人:layout_width =52dp 机器人:layout_height =80dp 机器人:layout_below =@ + ID /进度 机器人:的onClick =buttonClicked2 机器人:layout_marginTop =100dp 机器人:layout_toRightOf =@ + ID / min3_Button 机器人:文本=@字符串/ major3/> <按钮 机器人:ID =@ + ID / P4_Button 机器人:layout_width =52dp 机器人:layout_height =80dp 机器人:layout_below =@ + ID /进度 机器人:的onClick =buttonClicked2 机器人:layout_marginTop =100dp 机器人:layout_toRightOf =@ + ID / Maj3_Button 机器人:文本=@字符串/ perfect4/> <按钮 机器人:ID =@ + ID / A4_Button 机器人:layout_width =52dp 机器人:layout_height =80dp 机器人:layout_below =@ + ID / Octave_Button 机器人:的onClick =buttonClicked2 机器人:layout_marginTop =15dp 机器人:layout_marginLeft =5DP 机器人:文本=@字符串/全音/> <按钮 机器人:ID =@ + ID / P5_Button 机器人:layout_width =52dp 机器人:layout_height =80dp 机器人:layout_below =@ + ID / min2_Button 机器人:的onClick =buttonClicked2 机器人:layout_marginTop =15dp 机器人:layout_toRightOf =@ + ID / A4_Button 机器人:文本=@字符串/ perfect5/> <按钮 机器人:ID =@ + ID / minor6_Button 机器人:layout_width =52dp 机器人:layout_height =80dp 机器人:layout_below =@ + ID / Maj2_Button 机器人:的onClick =buttonClicked2 机器人:layout_marginTop =15dp 机器人:layout_toRightOf =@ + ID / P5_Button 机器人:文本=@字符串/ minor6/> <按钮 机器人:ID =@ + ID / Major6_Button 机器人:layout_width =52dp 机器人:layout_height =80dp 机器人:layout_below =@ + ID / min3_Button 机器人:的onClick =buttonClicked2 机器人:layout_marginTop =15dp 机器人:layout_toRightOf =@ + ID / minor6_Button 机器人:文本=@字符串/ major6/> <按钮 机器人:ID =@ + ID / minor7_Button 机器人:layout_width =52dp 机器人:layout_height =80dp 机器人:layout_below =@ + ID / Maj3_Button 机器人:的onClick =buttonClicked2 机器人:layout_marginTop =15dp 机器人:layout_toRightOf =@ + ID / Major6_Button 机器人:文本=@字符串/ minor7/> <按钮 机器人:ID =@ + ID / Major7_Button 机器人:layout_width =52dp 机器人:layout_height =80dp 机器人:layout_below =@ + ID / P4_Button 机器人:的onClick =buttonClicked2 机器人:layout_marginTop =15dp 机器人:layout_toRightOf =@ + ID / minor7_Button 机器人:文本=@字符串/ major7/>解决方案
我认为这是更好,如果你通过进度条作为参数传递给的AsyncTask :
最终进度进度=(进度)findViewById(R.id.Progressbar); progressBar.setProgress(0); //播放方法 最后的ImageButton播放=(的ImageButton)findViewById(R.id.Play); Play.setOnClickListener(新View.OnClickListener(){ @覆盖 公共无效的onClick(视图查看){ AsyncTaskBar任务=新AsyncTaskBar(); task.setProgressBar(进度); task.execute(); }
然后在你的的AsyncTask 声明 setProgressBar 方法:
公共类ShowDialogAsyncTask扩展的AsyncTask<太虚,整型,太虚> { 进度条; 公共无效setProgressBar(进度条){ this.bar =酒吧; } @覆盖 保护无效onProgressUpdate(整数...值){ super.onProgressUpdate(值); 如果(this.bar!= NULL){ bar.setProgress(值[0]); } }您可以使用的TextView 你要设置这样做。
在任何情况下,既然你提到你在这个新的,你可能想看看广播/接收模式。这是怎么一回事呢:
听起来有点势不可挡?这是第一次,但在这里的好处是:
I am a new programmer. I have seen lots of tutorials but can't understand what is wrong. I am trying to create a ProgressBar from an Async Task. However it always crashes my application.
Here is the "main" app:
package pt.flag.ensemble; import java.util.Random; import pt.flag.ensemble.task.AsyncTaskBar; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.media.MediaPlayer; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.Button; import android.widget.ImageButton; import android.widget.ProgressBar; import android.widget.Toast; public class Intervals extends Activity { private static Intervals instance; private Context context; private String answer; int right_question; int wrong_question; int randomInt2; public ProgressBar progressBar; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_intervals); // initializing the sounds final MediaPlayer sound1 = MediaPlayer.create(Intervals.this, R.raw.maj2); final MediaPlayer sound2 = MediaPlayer.create(Intervals.this, R.raw.maj3); final MediaPlayer sound3 = MediaPlayer.create(Intervals.this, R.raw.maj4); //ProgressBar instance=this; ProgressBar progressBar = (ProgressBar) findViewById(R.id.Progressbar); progressBar.setProgress(0); // Play Methods final ImageButton Play = (ImageButton) findViewById(R.id.Play); Play.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { new AsyncTaskBar().execute(); Play.setEnabled(false); // generate random number Random randomGenerator = new Random(); int randomInt = randomGenerator.nextInt(3) + 1; randomInt2 = randomInt; // picking the right sound to play switch (randomInt) { case 1: sound1.start(); answer = "M2"; break; case 2: sound2.start(); answer = "M3"; break; case 3: sound3.start(); answer = "P4"; break; } } }); //Audio Repeat Methods Button Repeat = (Button) findViewById(R.id.Repeat); Repeat.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { // picking the right sound to play switch (randomInt2) { case 1: sound1.start(); new AsyncTaskBar().execute(); answer = "M2"; break; case 2: sound2.start(); new AsyncTaskBar().execute(); answer = "M3"; break; case 3: sound3.start(); new AsyncTaskBar().execute(); answer = "P4"; break; } } }); } //Answering Methods public void buttonClicked2(View view) { Button clickedButton = (Button) view; if (clickedButton.getText().toString().equals(answer)) { Toast.makeText(Intervals.this, "You are Right!", Toast.LENGTH_LONG) .show(); right_question = right_question + 1; final ImageButton Play = (ImageButton) findViewById(R.id.Play); Play.setEnabled(true); // Passing results through SharedPreferences sharedPref = getSharedPreferences( "INTERVALRIGHTS", Context.MODE_PRIVATE); SharedPreferences.Editor editor = sharedPref.edit(); editor.putInt("SCORE", right_question); editormit(); } else { Toast.makeText(Intervals.this, "You are Wrong!", Toast.LENGTH_LONG) .show(); wrong_question = wrong_question + 1; // Passing results through SharedPreferences sharedPref02 = getSharedPreferences( "INTERVALWRONGS", Context.MODE_PRIVATE); SharedPreferences.Editor editor = sharedPref02.edit(); editor.putInt("SCORE02", wrong_question); editormit(); } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.intervals, 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. switch (item.getItemId()) { case R.id.action_settings: Intent intent = new Intent(Intervals.this, IntervalResults.class); startActivity(intent); break; default: return super.onOptionsItemSelected(item); } return true; } public static Intervals getApp() { return instance; } }Here is the AsyncTask class
package pt.flag.eventapp.task; import pt.flag.eventapp.Main; import android.os.AsyncTask; import android.os.SystemClock; import android.widget.Toast; public class ShowDialogAsyncTask extends AsyncTask<Void, Integer, Void> { int progress_status; @Override protected void onPreExecute() { // TODO Auto-generated method stub super.onPreExecute(); //Toast.makeText(Main.getApp(),"Invoke on PreExecute()", Toast.LENGTH_SHORT).show(); progress_status = 0 ; //Main.getApp().txt_percentage.setText("downloading 0%"); } @Override protected Void doInBackground(Void... params) { while (progress_status < 100){ progress_status +=2; publishProgress(progress_status); SystemClock.sleep(300); } return null; } @Override protected void onProgressUpdate(Integer... values) { super.onProgressUpdate(values); //Main.getApp().progressBar.setProgress(values[0]); //Main.getApp().txt_percentage.setText("downloading" + values[0] + "%"); } @Override protected void onPostExecute(Void result) { super.onPostExecute(result); //Toast.makeText(Main.getApp(), "Invoke onPostExecute()", Toast.LENGTH_SHORT).show(); //Main.getApp().txt_percentage.setText("download complete"); } }Here is the Log:
08-10 20:38:11.081: E/AndroidRuntime(21441): FATAL EXCEPTION: main 08-10 20:38:11.081: E/AndroidRuntime(21441): java.lang.NullPointerException 08-10 20:38:11.081: E/AndroidRuntime(21441): at pt.flag.ensemble.task.AsyncTaskBar.onProgressUpdate(AsyncTaskBar.java:34) 08-10 20:38:11.081: E/AndroidRuntime(21441): at pt.flag.ensemble.task.AsyncTaskBar.onProgressUpdate(AsyncTaskBar.java:1) 08-10 20:38:11.081: E/AndroidRuntime(21441): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:618) 08-10 20:38:11.081: E/AndroidRuntime(21441): at android.os.Handler.dispatchMessage(Handler.java:99) 08-10 20:38:11.081: E/AndroidRuntime(21441): at android.os.Looper.loop(Looper.java:156) 08-10 20:38:11.081: E/AndroidRuntime(21441): at android.app.ActivityThread.main(ActivityThread.java:4977) 08-10 20:38:11.081: E/AndroidRuntime(21441): at java.lang.reflect.Method.invokeNative(Native Method) 08-10 20:38:11.081: E/AndroidRuntime(21441): at java.lang.reflect.Method.invoke(Method.java:511) 08-10 20:38:11.081: E/AndroidRuntime(21441): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 08-10 20:38:11.081: E/AndroidRuntime(21441): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 08-10 20:38:11.081: E/AndroidRuntime(21441): at dalvik.system.NativeStart.main(Native Method)If I am correct, the log seems to indicate an error in line 34 at the AsyncTask class, which is "Intervals.getApp().progressBar.setProgress(values[0]);" I just don't know why...
Also, here is my xml file
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="schemas.android/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" > <ImageButton android:id="@+id/Play" android:contentDescription="@string/hello_world" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/ic_launcher" android:layout_marginTop="50dp" android:layout_marginLeft="50dp" /> <Button android:id="@+id/Repeat" android:contentDescription="@string/hello_world" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Repeat" android:layout_marginTop ="50dp" android:layout_toRightOf="@+id/Play" android:layout_marginLeft="25dp" /> <ProgressBar android:id="@+id/Progressbar" style="@android:style/Widget.ProgressBar.Horizontal" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="test" android:layout_marginTop="20dp" android:layout_below="@+id/Play" /> <Button android:id="@+id/Octave_Button" android:layout_width="52dp" android:layout_height="80dp" android:layout_marginLeft="5dp" android:layout_below="@+id/Progressbar" android:onClick="buttonClicked2" android:layout_marginTop="100dp" android:text="@string/octave" /> <Button android:id="@+id/min2_Button" android:layout_width="52dp" android:layout_height="80dp" android:layout_below="@+id/Progressbar" android:onClick="buttonClicked2" android:layout_marginTop="100dp" android:layout_toRightOf="@+id/Octave_Button" android:text="@string/minor2" /> <Button android:id="@+id/Maj2_Button" android:layout_width="52dp" android:layout_height="80dp" android:layout_below="@+id/Progressbar" android:onClick="buttonClicked2" android:layout_marginTop="100dp" android:layout_toRightOf="@+id/min2_Button" android:text="@string/major2" /> <Button android:id="@+id/min3_Button" android:layout_width="52dp" android:layout_height="80dp" android:layout_below="@+id/Progressbar" android:onClick="buttonClicked2" android:layout_marginTop="100dp" android:layout_toRightOf="@+id/Maj2_Button" android:text="@string/minor3" /> <Button android:id="@+id/Maj3_Button" android:layout_width="52dp" android:layout_height="80dp" android:layout_below="@+id/Progressbar" android:onClick="buttonClicked2" android:layout_marginTop="100dp" android:layout_toRightOf="@+id/min3_Button" android:text="@string/major3" /> <Button android:id="@+id/P4_Button" android:layout_width="52dp" android:layout_height="80dp" android:layout_below="@+id/Progressbar" android:onClick="buttonClicked2" android:layout_marginTop="100dp" android:layout_toRightOf="@+id/Maj3_Button" android:text="@string/perfect4" /> <Button android:id="@+id/A4_Button" android:layout_width="52dp" android:layout_height="80dp" android:layout_below="@+id/Octave_Button" android:onClick="buttonClicked2" android:layout_marginTop="15dp" android:layout_marginLeft="5dp" android:text="@string/tritone" /> <Button android:id="@+id/P5_Button" android:layout_width="52dp" android:layout_height="80dp" android:layout_below="@+id/min2_Button" android:onClick="buttonClicked2" android:layout_marginTop="15dp" android:layout_toRightOf="@+id/A4_Button" android:text="@string/perfect5" /> <Button android:id="@+id/minor6_Button" android:layout_width="52dp" android:layout_height="80dp" android:layout_below="@+id/Maj2_Button" android:onClick="buttonClicked2" android:layout_marginTop="15dp" android:layout_toRightOf="@+id/P5_Button" android:text="@string/minor6" /> <Button android:id="@+id/Major6_Button" android:layout_width="52dp" android:layout_height="80dp" android:layout_below="@+id/min3_Button" android:onClick="buttonClicked2" android:layout_marginTop="15dp" android:layout_toRightOf="@+id/minor6_Button" android:text="@string/major6" /> <Button android:id="@+id/minor7_Button" android:layout_width="52dp" android:layout_height="80dp" android:layout_below="@+id/Maj3_Button" android:onClick="buttonClicked2" android:layout_marginTop="15dp" android:layout_toRightOf="@+id/Major6_Button" android:text="@string/minor7" /> <Button android:id="@+id/Major7_Button" android:layout_width="52dp" android:layout_height="80dp" android:layout_below="@+id/P4_Button" android:onClick="buttonClicked2" android:layout_marginTop="15dp" android:layout_toRightOf="@+id/minor7_Button" android:text="@string/major7" />解决方案
I think it's better if you pass the progress bar as an argument to the AsyncTask:
final ProgressBar progressBar = (ProgressBar) findViewById(R.id.Progressbar); progressBar.setProgress(0); // Play Methods final ImageButton Play = (ImageButton) findViewById(R.id.Play); Play.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { AsyncTaskBar task = new AsyncTaskBar(); task.setProgressBar(progressBar); task.execute(); }And then on your AsyncTask declare the setProgressBar method:
public class ShowDialogAsyncTask extends AsyncTask<Void, Integer, Void> { ProgressBar bar; public void setProgressBar(ProgressBar bar) { this.bar = bar; } @Override protected void onProgressUpdate(Integer... values) { super.onProgressUpdate(values); if (this.bar != null) { bar.setProgress(values[0]); } }You could do the same with the TextView you're trying to set.
In any case, since you mentioned you're new at this you may want to take a look at the Broadcast/Receiver pattern. Here's how it goes:
Sounds a bit overwhelming? It is at first, but here are the benefits:
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