标签内容处理....如何在android系统？ [英] tab content handling.... how in android?

问题描述

我有两个选项卡的tabactivity。

在此tabactivity我已经EDITTEXT和按钮，搜索本地数据库。

我有一个listactivity类作为tabcontent。它示出了由的FrameLayout

我想根据这是在tabactivity中的EditText输入的文本以刷新listactivity。

该怎么做？

我在listactivity创建的方法：

 公共无效搜索（字符串TEMP）{
字符串VAL =温度;
尝试{
C = BruTube_Videos.this.getContentResolver（）查询（Constants.CONTENT_URI，空，Constants.TITLE +LIKE'％+ VAL +％'，空，DATETIME（+ Constants.PUBLISHED +）DESC）;
}赶上（例外五）{
Log.v（TAG，EXP的光标）;
}
显示（C）;
}
 

在这样的tabactivity调用此方法：

 的EditText ET1 =（EditText上）findViewById（R.id.EditText01）;
字符串TEMP = et1.getText（）的toString（）。
BruTube_Videos vdo_obj =新BruTube_Videos（）;
vdo_obj.search（临时）;
 

它显示了一个例外logcat的：

16 02-12：58：26.623：VERBOSE / BruTube_Videos（227）：异常的brutube搜索：java.lang.IllegalStateException：之前的onCreate不向活动系统服务（）

我如何管理呢？

感谢。

解决方案

  BruTube_Videos vdo_obj =新BruTube_Videos（）;
 

不要调用上的活动构造。你永远不创建活动 - 你告诉Android的启动它们。那是你错误的根源。

我强烈建议你得到完全摆脱了活动，并有一个 TabActivity 持有到查看 - - 一个是为您编辑表单的布局，一个是你的的ListView 。然后，你就不会感到困惑的code去的地方，因为只有一个活动。这也更有效从编程，存储器，CPU和电池的利用率的角度来看

i have a tabactivity with two tabs.

in this tabactivity i have edittext and button to search the local database.

i have a listactivity class as a tabcontent. it shows by the framelayout.

i want to refresh that listactivity based on the text entered in edittext which is in the tabactivity.

how to do that?

i created a method in a listactivity :

public void search(String temp) {
String val=temp;
try{
c=BruTube_Videos.this.getContentResolver().query(Constants.CONTENT_URI, null, Constants.TITLE+" like '%"+val+"%'", null, "DATETIME("+Constants.PUBLISHED+") DESC");
}catch(Exception e){
Log.v(TAG, "exp in cursor");
}
show(c);
}

invoke this method in a tabactivity like this:

EditText et1=(EditText) findViewById(R.id.EditText01);
String temp=et1.getText().toString();
BruTube_Videos vdo_obj=new BruTube_Videos();
vdo_obj.search(temp);

it shows an exception in logcat:

02-12 16:58:26.623: VERBOSE/BruTube_Videos(227): Exception in brutube search:java.lang.IllegalStateException: System services not available to Activities before onCreate()

how can i manage it?

thanks.

解决方案

BruTube_Videos vdo_obj=new BruTube_Videos();

Never call a constructor on an Activity. You never create activities -- you tell Android to start them. That is the source of your error.

I strongly encourage you to get rid of the activities altogether, and have a single TabActivity holding onto Views -- one that is a layout for your edit form, one that is your ListView. Then, you will not get confused as to where the code goes, since there is only one activity. This is also more efficient from a programming, memory, CPU, and battery utilization standpoint.

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