标签：android des blog http java 使用 os io
android.view.WindowManager$BadTokenException,ViewRootImpl.java,android.view.ViewRootImpl,setView,640,android.view.WindowManager$BadTokenException: Unable to add window -- token android.os.BinderProxy@444628b8 is not valid, is your activity running?通过日志，可以知道，这种问题一般是因为在AsyncTask中的onPostExecute中执行了启动Dialog操作，但是当前的Activity已经被销毁了，写一个错误代码复现一下该问题：
package com.example.testlibrary;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.AsyncTask;
import android.os.Bundle;
public class MainActivity extends Activity {
private UpdateUIAsyncTask asyncTask;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
updateUIProcess();
}
private void updateUIProcess() {
asyncTask = new UpdateUIAsyncTask();
asyncTask.execute();
}
private class UpdateUIAsyncTask extends AsyncTask<Void, Void, Boolean> {
@Override
protected void onPostExecute(Boolean result) {
if (!isCancelled() && result) {
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this)
.setTitle("标题")
.setMessage("这是内容")
.setPositiveButton("确定", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
})
.setNegativeButton("取消", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
AlertDialog dialog = builder.create();
dialog.show();
}
}
@Override
protected Boolean doInBackground(Void... params) {
if (!isCancelled()) {
try {
Thread.sleep(6000);
} catch (InterruptedException e) {
return false;
}
return true;
}
return true;
}
}
}启动应用程序，并且在6s以内退出应用程序，返回建即可，就会发现应用程序出现了异常：
android.view.WindowManager$BadTokenException: Unable to add window — token android.os.BinderProxy@4272a800 is not valid; is your activity running?.解决方法也很简单：在alertDialog.show()执行之前，判断当前的Activity是否已经销毁了，可以使用android提供的isFinishing()方法。同时，在Activity中也应该增加清理AsyncTask的操作，示例代码如下：
package com.example.testlibrary;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.AsyncTask;
import android.os.Bundle;
public class MainActivity extends Activity {
private UpdateUIAsyncTask asyncTask;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
updateUIProcess();
}
@Override
protected void onDestroy() {
// 增加清理AysncTask操作
if (asyncTask != null && asyncTask.getStatus() != AsyncTask.Status.FINISHED) {
asyncTask.cancel(true);
}
super.onDestroy();
}
private void updateUIProcess() {
asyncTask = new UpdateUIAsyncTask();
asyncTask.execute();
}
private class UpdateUIAsyncTask extends AsyncTask<Void, Void, Boolean> {
@Override
protected void onPostExecute(Boolean result) {
// show dialog之前增加判断当前Activity是否finish操作
if (!isCancelled() && result && MainActivity.this != null && !MainActivity.this.isFinishing()) {
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this)
.setTitle("标题")
.setMessage("这是内容")
.setPositiveButton("确定", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
})
.setNegativeButton("取消", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
AlertDialog dialog = builder.create();
dialog.show();
}
}
@Override
protected Boolean doInBackground(Void... params) {
if (!isCancelled()) {
try {
Thread.sleep(6000);
} catch (InterruptedException e) {
return false;
}
return true;
}
return true;
}
}
}
Android BadTokenException 问题解决,布布扣,bubuko.com
Android BadTokenException 问题解决
标签：android des blog http java 使用 os io
原文地址：http://blog.csdn.net/wzy_1988/article/details/38424569
