Android - 如何清除 textView？
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Android - How to clear textView?
提问by user1170168
I have created an android app in java using eclipse which creates a Sqlite database and lets the user add data to it. Users can also search for existing data. I used android cursor objects. How do I clear the text box after a query is completed ? For example, I type "value" to retrieve all records associated with that value. Now I want to perform another search. When I click on the text box, I would like the text box to be cleared for my next search.
我使用 eclipse 在 java 中创建了一个 android 应用程序，它创建了一个 Sqlite 数据库并让用户向其中添加数据。用户还可以搜索现有数据。我使用了android光标对象。查询完成后如何清除文本框？例如，我键入“value”来检索与该值关联的所有记录。现在我想执行另一次搜索。当我单击文本框时，我希望为下一次搜索清除文本框。
This is part of my code for inserting and retrieving data :
这是我插入和检索数据的代码的一部分：
db.execSQL("CREATE TABLE IF NOT EXISTS " + MY_DATABASE_TABLE + " (id INTEGER PRIMARY KEY AUTOINCREMENT, " + " name TEXT," + " number TEXT);");
Cursor cur = db.rawQuery("INSERT INTO " + MY_DATABASE_TABLE + " (name, number)" + " VALUES ( \"" + newname + "\", \"" + newnumber + "\");", null);
cur.moveToFirst();
while (cur.isAfterLast() == false)
{
result.append("\n" + "Id: " + cur.getString(0) + " | " + "Name: " + cur.getString(1) + " | " + "Phone Number: " + cur.getString(2) + "\n");
cur.moveToNext();
}
cur.close();
Cursor c = db.rawQuery("SELECT * FROM " + MY_DATABASE_TABLE, new String [] {} );
c.moveToFirst();
while (c.isAfterLast() == false) {
result.append("\n" + "Id: " + c.getString(0) + " | " + "Name: " + c.getString(1) + " | " + "Phone Number: " + c.getString(2) + "\n");
c.moveToNext();
}
c.close();
Thanks.
谢谢。
回答by Dave
First you probably don't want to clear your database to just clear a textView. So the relevant code would be inside your activity.
首先，您可能不想清除数据库来清除 textView。因此相关代码将在您的活动中。
So if you are using a textView you would do something like this in code
所以如果你使用的是 textView 你会在代码中做这样的事情
// Global variable
// 全局变量
TextView yourTexView;
// In your activities on Create
// 在你的 Create 活动中
yourTexView = (TextView) findViewById(R.id.yourTexView );
yourTexView .setOnClickListener(yourClickListener)
// Somewhere In the activities class
// 在活动类的某个地方
/**
* Tour Click Handler - This will clear the textview whenever someone clicks it.
*/
private OnClickListener yourClickListener= new OnClickListener() {
public void onClick(View v) {
yourTexView.setText("");
}
};
// In your xml file - change as you need
// 在您的 xml 文件中 - 根据需要更改
<TextView
android:id="@+id/yourTexView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="" />
Hopefully this helps, Cheers
希望这会有所帮助，干杯
回答by realkstrawn93
Either setText("")or setText(null)— either one of those would work. I use setText(null)for readability reasons.
无论是setText("")或setText(null)-那些任何一个会工作。我setText(null)出于可读性原因使用。
