Android的滑动界面

【实例简介】

  首次启动安卓程序的滑动界面的代码实现。

【实例截图

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【核心代码】
package com.example.androidhttpdemo; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.support.v4.view.ViewPager; import android.view.LayoutInflater; import android.view.View; import android.widget.Button; import android.widget.ImageView; import android.widget.LinearLayout; import com.example.androidhttpdemo.adapter.GuideViewPagerAdapter; import com.example.androidhttpdemo.util.SharedPreferencesUtil; import java.util.ArrayList; import java.util.List; public class WelcomeGuideActivity extends Activity implements View.OnClickListener { private ViewPager vp; private GuideViewPagerAdapter adapter; private Listviews; private Button startBtn; // 引导页图片资源 private static final int[] pics = { R.layout.guide_view1, R.layout.guide_view2, R.layout.guide_view3}; // 底部小点图片 private ImageView[] dots; // 记录当前选中位置 private int currentIndex; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_guide); views = new ArrayList(); // 初始化引导页视图列表 for (int i = 0; i < pics.length; i ) { View view = LayoutInflater.from(this).inflate(pics[i], null); if (i == pics.length - 1) { startBtn = (Button) view.findViewById(R.id.btn_enter); startBtn.setTag("enter"); startBtn.setOnClickListener(this); } views.add(view); } vp = (ViewPager) findViewById(R.id.vp_guide); adapter = new GuideViewPagerAdapter(views); vp.setAdapter(adapter); vp.addOnPageChangeListener(new PageChangeListener()); initDots(); } @Override protected void onResume() { super.onResume(); } @Override protected void onPause() { super.onPause(); // 如果切换到后台，就设置下次不进入功能引导页 SharedPreferencesUtil.putBoolean(WelcomeGuideActivity.this, SharedPreferencesUtil.FIRST_OPEN, false); finish(); } @Override protected void onStop() { super.onStop(); } @Override protected void onDestroy() { super.onDestroy(); } private void initDots() { LinearLayout ll = (LinearLayout) findViewById(R.id.ll); dots = new ImageView[pics.length]; // 循环取得小点图片 for (int i = 0; i < pics.length; i ) { // 得到一个LinearLayout下面的每一个子元素 dots[i] = (ImageView) ll.getChildAt(i); dots[i].setEnabled(false);// 都设为灰色 dots[i].setOnClickListener(this); dots[i].setTag(i);// 设置位置tag，方便取出与当前位置对应 } currentIndex = 0; dots[currentIndex].setEnabled(true); // 设置为白色，即选中状态 } /** * 设置当前view * * @param position */ private void setCurView(int position) { if (position < 0 || position >= pics.length) { return; } vp.setCurrentItem(position); } /** * 设置当前指示点 * * @param position */ private void setCurDot(int position) { if (position < 0 || position > pics.length || currentIndex == position) { return; } dots[position].setEnabled(true); dots[currentIndex].setEnabled(false); currentIndex = position; } @Override public void onClick(View v) { if (v.getTag().equals("enter")) { enterMainActivity(); return; } int position = (Integer) v.getTag(); setCurView(position); setCurDot(position); } private void enterMainActivity() { Intent intent = new Intent(WelcomeGuideActivity.this, Login.class); startActivity(intent); SharedPreferencesUtil.putBoolean(WelcomeGuideActivity.this, SharedPreferencesUtil.FIRST_OPEN, false); finish(); } private class PageChangeListener implements ViewPager.OnPageChangeListener { @Override public void onPageScrollStateChanged(int position) { } @Override public void onPageScrolled(int position, float arg1, int arg2) { } @Override public void onPageSelected(int position) { // 设置底部小点选中状态 setCurDot(position); } } }