android之ScrollView

  當您TextView中的字數太多，不足以在屏幕上完整顯示時，如何使一個TextView用ScrollView滾動顯示呢？

  下面我舉一個簡單的例子：

  代碼：

import java.io.File;  
import java.io.FileInputStream;  
import java.io.IOException;  
import org.apache.http.util.EncodingUtils;  
import android.app.Activity;  
import android.os.Bundle;  
import android.view.View;  
import android.widget.Button;  
import android.widget.ScrollView;  
import android.widget.TextView;  
import android.widget.Toast;  
public class pass extends Activity {  
    /** Called when the activity is first created. */ 
    final String TEXT_ENCODING = "UTF-8";  
    ScrollView sv;  
    TextView tv;  
    @Override 
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.passdialog);  
        sv=(ScrollView)findViewById(R.id.sv);  
        tv=(TextView)findViewById(R.id.txtView);  
        tv.setText("mmmmmmmmmmmmmmmmmmmmm" +  
          "fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff" +  
          "llllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll+  
          "gggggggggggggggggggggggggggggggggggggggggggggggggg" +  
          "vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv，" +  
          "qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq" +  
          "hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh");  
    }  
}  
 
passdialog.xml:  
 
<?xml version="1.0" encoding="utf-8"?>  
<AbsoluteLayout  
    android:id="@+id/widget38" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    xmlns:android="http://schemas.android.com/apk/res/android" 
>  
    <LinearLayout  
        android:id="@+id/widget32" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        xmlns:android="http://schemas.android.com/apk/res/android" 
        android:layout_x="0px" 
        android:layout_y="0px" 
    >  
    </LinearLayout>  
    <ScrollView  
    android:id="@+id/sv" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_x="0px" 
    android:layout_y="20px" 
    >  
        <TextView  
        android:id="@+id/txtView" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:textSize="22sp" 
        android:gravity="center_vertical" 
        >  
        </TextView>  
    </ScrollView>  
</AbsoluteLayout>