android.view.WindowManager$BadTokenException: Unable to add window — token null
2014-09-11 17:40
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转自 http://aijiawang-126-com.iteye.com/blog/662336
错误产生:
Java代码
private Context mcontext;
@Override
protected void onCreate(Bundle savedInstanceState) {mcontext = getApplicationContext();
System.out.println("mcontext=" + mcontext);
}
Java代码
new AlertDialog.Builder(mcontext)
.setIcon(android.R.drawable.ic_dialog_alert)
.setTitle("Warnning")
.setMessage(
"You forget to write the message. Do you want to fill out it ??")
.setPositiveButton("Yes", positiveListener).setNegativeButton(
"No", negativeListener).create().show();
导致报这个错是在于new AlertDialog.Builder(mcontext),虽然这里的参数是AlertDialog.Builder(Context context)但我们不能使用getApplicationContext()获得的Context,而必须使用Activity,因为只有一个Activity才能添加一个窗体。
解决方法:将new AlertDialog.Builder(Context context)中的参数用Activity.this(Activity是你的Activity的名称)来填充就可以正确的创建一个Dialog了。
Java代码
new AlertDialog.Builder(MyActivity.this)
.setIcon(android.R.drawable.ic_dialog_alert)
.setTitle("Warnning")
.setMessage(
"You forget to write the message. Do you want to fill out it ??")
.setPositiveButton("Yes", positiveListener).setNegativeButton(
"No", negativeListener).create().show();
错误产生:
Java代码
private Context mcontext;
@Override
protected void onCreate(Bundle savedInstanceState) {mcontext = getApplicationContext();
System.out.println("mcontext=" + mcontext);
}
Java代码
new AlertDialog.Builder(mcontext)
.setIcon(android.R.drawable.ic_dialog_alert)
.setTitle("Warnning")
.setMessage(
"You forget to write the message. Do you want to fill out it ??")
.setPositiveButton("Yes", positiveListener).setNegativeButton(
"No", negativeListener).create().show();
导致报这个错是在于new AlertDialog.Builder(mcontext),虽然这里的参数是AlertDialog.Builder(Context context)但我们不能使用getApplicationContext()获得的Context,而必须使用Activity,因为只有一个Activity才能添加一个窗体。
解决方法:将new AlertDialog.Builder(Context context)中的参数用Activity.this(Activity是你的Activity的名称)来填充就可以正确的创建一个Dialog了。
Java代码
new AlertDialog.Builder(MyActivity.this)
.setIcon(android.R.drawable.ic_dialog_alert)
.setTitle("Warnning")
.setMessage(
"You forget to write the message. Do you want to fill out it ??")
.setPositiveButton("Yes", positiveListener).setNegativeButton(
"No", negativeListener).create().show();
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