android 滚动视图（ScrollView）学习与应用
http://blog.csdn.net/applezhengxd/article/details/5574356
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="增加按钮" /> <ScrollView android:id="@+id/scrollView1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:scrollbars="vertical"> <LinearLayout android:id="@+id/linearLayout1" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="wrap_content" > </LinearLayout> </ScrollView></LinearLayout>
package com.scrollview;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.util.Log;import android.view.KeyEvent;import android.view.View;import android.widget.Button;import android.widget.LinearLayout;import android.widget.ScrollView;import android.widget.TextView;public class ScrollViewActivity extends Activity { /** Called when the activity is first created. */// http://blog.csdn.net/applezhengxd/article/details/5574356private Button button1;private ScrollView scrollView1;private LinearLayout linearLayout1;private final Handler mHandler = new Handler();private static final String LOG_TAG = "ScrollViewActivity"; @Override protected void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.main); linearLayout1 = (LinearLayout) findViewById(R.id.linearLayout1); scrollView1 = (ScrollView) findViewById(R.id.scrollView1); Button button = (Button) findViewById(R.id.button1); button.setOnClickListener(new Button.OnClickListener() { private int mIndex = 1; @Override public void onClick(View arg0) { // TODO Auto-generated method stub TextView textView = new TextView(ScrollViewActivity.this); textView.setText("Text View " + mIndex); LinearLayout.LayoutParams p = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT ); linearLayout1.addView(textView, p); Button buttonView = new Button(ScrollViewActivity.this); buttonView.setText("Button " + mIndex++); linearLayout1.addView(buttonView, p); //改变默认焦点切换 buttonView.setOnKeyListener(new View.OnKeyListener() { public boolean onKey(View v, int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_DPAD_DOWN && event.getAction() == KeyEvent.ACTION_DOWN && v == linearLayout1.getChildAt(linearLayout1.getChildCount() - 1)) { findViewById(R.id.button1).requestFocus(); return true; } return false; } }); //投递一个消息进行滚动 mHandler.post(mScrollToBottom); } }); //改变默认焦点切换 button.setOnKeyListener(new Button.OnKeyListener() { @Override public boolean onKey(View v, int keyCode, KeyEvent event) { // TODO Auto-generated method stub Log.d(LOG_TAG, event.toString()); View viewToFoucus = null; if (event.getAction() == KeyEvent.ACTION_DOWN) { switch (keyCode) { case KeyEvent.KEYCODE_DPAD_UP: int iCount = linearLayout1.getChildCount(); if ( iCount > 0) { viewToFoucus = linearLayout1.getChildAt(iCount - 1); } break; case KeyEvent.KEYCODE_DPAD_DOWN: if (linearLayout1.getChildCount() > 1) { viewToFoucus = linearLayout1.getChildAt(1); } break; default: break; } } if (viewToFoucus != null) { viewToFoucus.requestFocus(); return true; } else { return false; } } }); } private Runnable mScrollToBottom = new Runnable() { @Override public void run() { // TODO Auto-generated method stub Log.d(LOG_TAG, "ScrollY: " + scrollView1.getScrollY()); int off = linearLayout1.getMeasuredHeight() - scrollView1.getHeight(); if (off > 0) { scrollView1.scrollTo(0, off); } } }; }