无法在android中动态添加TextView

有一种情况是，当用户按下按钮时，新的TextView将被添加到LinearLayout中。这里是我的测试案例：无法在android中动态添加TextView

package com.ggd543.json; 

import android.app.Activity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
import android.widget.LinearLayout; 
import android.widget.TextView; 
import org.apache.http.HttpRequest; 
import org.apache.http.HttpResponse; 
import org.apache.http.client.HttpClient; 
import org.apache.http.client.methods.HttpGet; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.apache.http.util.EntityUtils; 
import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 
import org.w3c.dom.Text; 

import java.io.IOException; 

public class JsonActivity extends Activity { 
    /** 
    * Called when the activity is first created. 
    */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     TextView tv = (TextView) findViewById(R.id.text); 
     // set a listener 
     setOnclickListener(); 

    } 

    private void setOnclickListener() { 
     ((Button) findViewById(R.id.click)).setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       final TextView tv = new TextView(JsonActivity.this); 
       LinearLayout.LayoutParams p = new LinearLayout.LayoutParams(
         LinearLayout.LayoutParams.FILL_PARENT, 
         LinearLayout.LayoutParams.WRAP_CONTENT 
       ); 
       LinearLayout layout = (LinearLayout) findViewById(R.id.layout); 
       layout.addView(tv, p) 
       // Start a thread to get some info and display it through Textview 
       new Thread() { 
        public void run() { 
         HttpClient client = new DefaultHttpClient(); 
         HttpGet req = new HttpGet("http://10.0.2.2:9111/flight/CZ1310?date=2011-12-24"); 
         try { 
          HttpResponse res = client.execute(req); 
          String str = EntityUtils.toString(res.getEntity()); 
          // set the content string 
          tv.setText(str); 
         } catch (IOException e) { 
          e.printStackTrace(); 
          tv.setText(e.getMessage()); 
         } 
        } 
       }.start(); 
      } 
     }); 
    } 

}

但不幸的是当按下按钮时，它抛出一个Exception：

12-25 17:06:42.486: ERROR/AndroidRuntime(3541): Uncaught handler: thread Thread-8 exiting due to uncaught exception 
12-25 17:06:42.486: ERROR/AndroidRuntime(3541): android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views. 
     at android.view.ViewRoot.checkThread(ViewRoot.java:2683) 
     at android.view.ViewRoot.requestLayout(ViewRoot.java:557) 
     at android.view.View.requestLayout(View.java:7918) 
     at android.view.View.requestLayout(View.java:7918) 
     at android.view.View.requestLayout(View.java:7918) 
     at android.view.View.requestLayout(View.java:7918) 
     at android.view.View.requestLayout(View.java:7918) 
     at android.widget.TextView.checkForRelayout(TextView.java:5373) 
     at android.widget.TextView.setText(TextView.java:2684) 
     at android.widget.TextView.setText(TextView.java:2552) 
     at android.widget.TextView.setText(TextView.java:2527) 
     at com.ggd543.json.JsonActivity$1$1.run(JsonActivity.java:54)

PS：要访问http://10.0.2.2:9111/flight/CZ1310?date=2011-12-24会返回一个JSON字符串。

来源

2011-12-25 爱国者

stacktrace说明了一切：您只能从UI线程更新UI。

使用runOnUiThread()看到这个link。

来源

2011-12-25 17:30:46

无法在android中动态添加TextView

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