android - Activity 上的左/右滑动效果

Question

我有一个 Activity ，我在其中显示一个问题。此屏幕上有上一个、下一个按钮。

每次用户按下上一个/下一个 - 都会显示一个不同的问题。现在我想要在按下上一个/下一个按钮时( Activity 保持不变)对此 View 产生滑动(右左)影响。

我可以像这样使用跨 Activity 的转换(从一个 Activity View 到另一个 Activity View )实现滑动效果:

...
startActivity(intent);
overridePendingTransition(R.anim.anim1, R.anim.anim2);
...

但我如何对单个 Activity 产生影响？

Answer 1

当然你可以使用 ViewPager 来做到这一点

<android.support.v4.view.ViewPager
    android:id="@+id/myviewpager"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

这是一个Link一个非常简洁的例子来满足您的需要。

我给你解释一下

这是主要 Activity 布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context="com.example.androidviewpagerapp.MainActivity" >

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_horizontal"
    android:autoLink="web"
    android:text="http://android-er.blogspot.com/"
    android:textStyle="bold" />

<android.support.v4.view.ViewPager
    android:id="@+id/myviewpager"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

</LinearLayout>

你的 MainActivity 应该是这样的

import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import android.app.Activity;
import android.graphics.Color;
import android.graphics.Typeface;
import android.os.Bundle;

public class MainActivity extends Activity {

 ViewPager viewPager;
 MyPagerAdapter myPagerAdapter;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  viewPager = (ViewPager)findViewById(R.id.myviewpager);
  myPagerAdapter = new MyPagerAdapter();
  viewPager.setAdapter(myPagerAdapter);

 }

 private class MyPagerAdapter extends PagerAdapter{

  int NumberOfPages = 5;

  int[] res = { 
   android.R.drawable.ic_dialog_alert,
   android.R.drawable.ic_menu_camera,
   android.R.drawable.ic_menu_compass,
   android.R.drawable.ic_menu_directions,
   android.R.drawable.ic_menu_gallery};
  int[] backgroundcolor = { 
   0xFF101010,
   0xFF202020,
   0xFF303030,
   0xFF404040,
   0xFF505050};

  @Override
  public int getCount() {
   return NumberOfPages;
  }

  @Override
  public boolean isViewFromObject(View view, Object object) {
   return view == object;
  }

  @Override
  public Object instantiateItem(ViewGroup container, int position) {


  TextView textView = new TextView(MainActivity.this);
  textView.setTextColor(Color.WHITE);
  textView.setTextSize(30);
  textView.setTypeface(Typeface.DEFAULT_BOLD);
  textView.setText(String.valueOf(position));

  ImageView imageView = new ImageView(MainActivity.this);
  imageView.setImageResource(res[position]);
  LayoutParams imageParams = new LayoutParams(
    LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT);
  imageView.setLayoutParams(imageParams);

  LinearLayout layout = new LinearLayout(MainActivity.this);
  layout.setOrientation(LinearLayout.VERTICAL);
  LayoutParams layoutParams = new LayoutParams(
    LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT);
  layout.setBackgroundColor(backgroundcolor[position]);
  layout.setLayoutParams(layoutParams);
  layout.addView(textView);
  layout.addView(imageView);

  final int page = position;
  layout.setOnClickListener(new OnClickListener(){

@Override
public void onClick(View v) {
 Toast.makeText(MainActivity.this, 
  "Page " + page + " clicked", 
  Toast.LENGTH_LONG).show();
}});

  container.addView(layout);
  return layout;
  }

  @Override
  public void destroyItem(ViewGroup container, int position, Object object)     {
   container.removeView((LinearLayout)object);
  }

 }

}