更改显示TextView显示

首先打开”main.xml”布局文件

，添加TextView命名为tvHelloWorld：保存。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:id="@+id/tvHelloWorld"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
</LinearLayout>

这时候Eclipse编译器会自动生成TextView代码,打开R.java文件





可以看到

/* AUTO-GENERATED FILE.  DO NOT MODIFY.
*
* This class was automatically generated by the
* aapt tool from the resource data it found.  It
* should not be modified by hand.
*/

package idroidgame.ActivityTest;

public final class R {
public static final class attr {
}
public static final class drawable {
public static final int icon=0x7f020000;
}
public static final class id {
public static final int tvHelloWorld=0x7f050000;
}
public static final class layout {
public static final int main=0x7f030000;
}
public static final class string {
public static final int app_name=0x7f040001;
public static final int hello=0x7f040000;
}
}

然后在ActivityText.java中输入

package idroidgame.ActivityTest;

import android.app.Activity;
import android.os.Bundle;

import android.widget.TextView;
public class ActivityTest extends Activity {
TextView tv=null;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

tv=(TextView)this.findViewById(R.id.tvHelloWorld);
String str="设置TextView的值";
tv.setText(str);
    }

}

TextView的setText有很多重载方法；