安卓开发--scrollview
package com.cnn.scrollviewdemo01; import android.R.integer; import android.annotation.SuppressLint; import android.app.Activity; import android.os.Bundle; import android.util.Log; import android.view.Menu; import android.view.MenuItem; import android.view.MotionEvent; import android.view.View; import android.view.View.OnClickListener; import android.view.View.OnTouchListener; import android.widget.Button; import android.widget.ScrollView; import android.widget.TextView; @SuppressLint("ClickableViewAccessibility") public class MainActivity extends Activity { private TextView textView; private ScrollView scrollView; private Button btnUp,btnDown; int scrollY=0; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); textView= (TextView) findViewById(R.id.textView1); textView.setText(getResources().getString(R.string.china_news)); scrollView=(ScrollView) findViewById(R.id.scrollView1); scrollView.setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { // TODO 自动生成的方法存根 switch (event.getAction()) { case MotionEvent.ACTION_UP://手指抬起 break; case MotionEvent.ACTION_DOWN://手指落下 break; case MotionEvent.ACTION_MOVE://手指滑动 if (scrollView.getScaleY()<=0) {//顶部 Log.i("tag", "没有滑动"); } //textView总高度<=一屏幕的高度+滚动条的滚动距离 if (scrollView.getChildAt(0).getMeasuredHeight()<= scrollView.getHeight()+scrollView.getScrollY()) { Log.i("tag", "没有到底部"); textView.append("123111111111111111111111111111111111111111111111111111111");//(getResources().getString(R.string.china_news)); } break; } return false; } }); btnUp=(Button) findViewById(R.id.button2); btnDown=(Button) findViewById(R.id.button1); btnDown.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO 自动生成的方法存根 //scrollY=scrollY+10; //scrollView.setScrollY(scrollY); scrollView.scrollBy(0, 20); } }); btnUp.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO 自动生成的方法存根 //scrollY=scrollY-10; //scrollView.setScrollY(scrollY); scrollView.scrollBy(0, -20); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } }
<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/button2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Up" /> <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Donw" /> <ScrollView android:id="@+id/scrollView1" android:layout_width="match_parent" android:layout_height="wrap_content" > <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="TextView" /> </LinearLayout> </ScrollView> </LinearLayout>