Caused by: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not
2013-06-27 19:53
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今天敲代码报这样错误Caused by: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
事发地点为:
DialogUtil.showNetErrorDialog(getApplicationContext());
从犯:
public static void showNetErrorDialog(final Context ctx) {
AlertDialog.Builder builder = new AlertDialog.Builder(ctx)
.setMessage("没有网络,前去打通?").setIcon(R.drawable.ic_launcher)
.setCancelable(true);
builder.setPositiveButton("前往", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent wifiSettingsIntent = new Intent(
"android.settings.WIFI_SETTINGS");
ctx.startActivity(wifiSettingsIntent);
}
});
builder.setNegativeButton("拉倒", null);
builder.create().show();
}解决方案:
DialogUtil.showNetErrorDialog(BookDetailActivity.this);需要传入本身的activity.this这个context!
原因不详
类似案件:
自己做一个小程序,给windowManager添加一个view的时候,一直报一个错误:
Caused by: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
这个错误意思就是 token为空,所以添加不上view,我在网上查相关信息,他们说传入的context对象有问题,但是我反复测试在activity中启动widnow并且添加view是正常的,难道就不能在发起一个广播启动windowManager并且添加view?
如果是添加view出错,那就说明应该是windowManager.layoutParams中应该缺少什么参数,结果我在网上查阅了一下,真的是需要在windowManager.layoutParams中添加一些type的,结果自己实验了一下,结果真的可以了 ,具体的代码如下:
[java] view
plaincopy
/**
* @author spring sky
* Email vipa1888@163.com
* My Name: 石明政
* QQ 840950105
* @param height 高度
* @param width 宽度
* @return
*/
private LayoutParams getLayoutParam(int height,int width)
{
if(wmParam==null)
{
//为windowManager.layoutParams添加type和flag,这样发送广播才不会出现token is null这样的错误
wmParam = new WindowManager.LayoutParams(-1, 4);
wmParam.windowAnimations = 0;
wmParam.format = PixelFormat.TRANSLUCENT
| WindowManager.LayoutParams.FIRST_SYSTEM_WINDOW;
}
wmParam.height = height;
wmParam.width = width;
return wmParam;
}
这样,在windowManager中添加view就可以了
退堂。。。。。。。。。。。
威武~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
事发地点为:
DialogUtil.showNetErrorDialog(getApplicationContext());
从犯:
public static void showNetErrorDialog(final Context ctx) {
AlertDialog.Builder builder = new AlertDialog.Builder(ctx)
.setMessage("没有网络,前去打通?").setIcon(R.drawable.ic_launcher)
.setCancelable(true);
builder.setPositiveButton("前往", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent wifiSettingsIntent = new Intent(
"android.settings.WIFI_SETTINGS");
ctx.startActivity(wifiSettingsIntent);
}
});
builder.setNegativeButton("拉倒", null);
builder.create().show();
}解决方案:
DialogUtil.showNetErrorDialog(BookDetailActivity.this);需要传入本身的activity.this这个context!
原因不详
类似案件:
自己做一个小程序,给windowManager添加一个view的时候,一直报一个错误:
Caused by: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
这个错误意思就是 token为空,所以添加不上view,我在网上查相关信息,他们说传入的context对象有问题,但是我反复测试在activity中启动widnow并且添加view是正常的,难道就不能在发起一个广播启动windowManager并且添加view?
如果是添加view出错,那就说明应该是windowManager.layoutParams中应该缺少什么参数,结果我在网上查阅了一下,真的是需要在windowManager.layoutParams中添加一些type的,结果自己实验了一下,结果真的可以了 ,具体的代码如下:
[java] view
plaincopy
/**
* @author spring sky
* Email vipa1888@163.com
* My Name: 石明政
* QQ 840950105
* @param height 高度
* @param width 宽度
* @return
*/
private LayoutParams getLayoutParam(int height,int width)
{
if(wmParam==null)
{
//为windowManager.layoutParams添加type和flag,这样发送广播才不会出现token is null这样的错误
wmParam = new WindowManager.LayoutParams(-1, 4);
wmParam.windowAnimations = 0;
wmParam.format = PixelFormat.TRANSLUCENT
| WindowManager.LayoutParams.FIRST_SYSTEM_WINDOW;
}
wmParam.height = height;
wmParam.width = width;
return wmParam;
}
这样,在windowManager中添加view就可以了
退堂。。。。。。。。。。。
威武~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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