android应用关闭时没有错误，当点击imageview时

Question

我创建了一个简单的ImageView，并尝试点击时启动一个活动，但当我在模拟器中单击它时，该应用只是崩溃并给我（等待或在这里关闭应用程序提示） 是我：

XML：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:fillViewport="true" 
android:orientation="vertical"> 

<ImageView 
    android:id="@+id/about" 
    android:layout_width="match_parent" 
    android:layout_height="450dp" 
    android:background="@color/colorPrimaryDark" 
    android:src="@drawable/twoth" /> 

</LinearLayout> 

这里是我的Java代码

public class MainUi extends AppCompatActivity { 

    //Variables Declaration. 
    private Button btn1, btn2, btn3, btn4; 
    private ImageView img; 


    //Called when the activity is first created. 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     setContentView(R.layout.activity_main_ui); 
     //Variables Initialization and OnClick Method 


     img = (ImageView) findViewById(R.id.about); 
     img.setOnClickListener(new View.OnClickListener() { 
      public void onClick(View arg0) { 
       //Start another activity 
       Intent myIntent = new Intent(MainUi.this, Query.class); 
       startActivity(myIntent); 
      } 
     }); 


    } 


} 

Answer 1

的 '等待或接近' 的事情线索我认为查询活动中有一些东西在主线程上做了很多工作。

尝试使用AsyncTask并将所有长时间运行的进程放在doInBackground部分中，然后在onPostExecute中处理响应。

我猜这取决于你实际做了什么，但AsyncTask应该是一个好的开始。

Answer 2

这里是完整的代码，我添加了其余的代码，以防万一您可以从外部（查询）类处理它，而不是在Async类中处理它。

public class Query extends AppCompatActivity { 
    private ArrayList<String[]> BB; 
    private ArrayList<String[]> AA = new ArrayList<String[]>(); 
    private Socket socket = null; 
    private ObjectInputStream in = null; 
    private DataOutputStream out = null; 


    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_query); 
     if (android.os.Build.VERSION.SDK_INT > 9) { 
      StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build(); 
      StrictMode.setThreadPolicy(policy); 
     } 
     try { 
      AA = new AsyncAction().execute().get(); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } finally { 
      if (socket != null) { 
       try { 
        socket.close(); 
       } catch (IOException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } 
      } 
      setTextViews(); 


     } 
    } 

    public void setTextViews() { 
     View linearLayout = findViewById(R.id.info); 
     for (int y = 0; y < AA.size(); y++) { 
      // for (int x = 0; x < AA.get(0).length; x++) {} 
      TextView name = new TextView(this); 
      name.setText(AA.get(y)[0]); 
      name.setId(y); 
      name.setGravity(Gravity.CENTER); 
      name.setTextSize(30); 
      name.setPadding(0, 30, 0, 0); 
      name.setTextColor(this.getResources().getColor(R.color.icons)); 
      name.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT, 0)); 

      ProgressBar pb = new ProgressBar(this, null, android.R.attr.progressBarStyleHorizontal); 
      Drawable drawable = pb.getProgressDrawable(); 
      drawable.setColorFilter(new LightingColorFilter(0xFF000000, this.getResources().getColor(R.color.colorPrimary))); 
      pb.setProgress(100); 

      final int finalY = y; 
      name.setOnClickListener(new View.OnClickListener() { 
       public void onClick(View arg0) { 
        Bundle b = new Bundle(); 
        b.putStringArray("list", AA.get(finalY)); 
        Intent i = new Intent(Query.this, Info.class); 
        i.putExtras(b); 
        startActivity(i); 
       } 
      }); 
      ((LinearLayout) linearLayout).addView(name); 
      ((LinearLayout) linearLayout).addView(pb); 

     } 
    } 


    private class AsyncAction extends AsyncTask<String, Void, ArrayList> { 

     protected ArrayList doInBackground(String... args) { 
      try { 


       socket = new Socket(port, 8888); 
       out = new DataOutputStream(socket.getOutputStream()); 
       in = new ObjectInputStream(socket.getInputStream()); 
//    action 
       out.writeInt(2); 
       try { 

        in = new ObjectInputStream(socket.getInputStream()); 
        BB = (ArrayList<String[]>) in.readObject(); 


        in.close(); 
        socket.close(); 

       } catch (Exception e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } 
      } catch (UnknownHostException e1) { 
       e1.printStackTrace(); 
      } catch (IOException e1) { 
       e1.printStackTrace(); 
      } 


      return BB;//returns what you want to pass to the onPostExecute() 
     } 

     protected void onPostExecute(ArrayList result) { 
      AA = result; 

     } 
    } 
}