APP开发:导航界面

需求：

先进入欢迎界面，停留3秒，若是第一次打开app，则再次进入导航界面；若不是，则进入主界面。

欢迎界面（a.jpg）

导航界面 (b.jpg + c.jpg + d.jpg)

主界面

效果图：



用到的知识点：

Handler + SharedPreferences + ViewPager + PagerAdapter

目录：



activity_welcome.xml

<RelativeLayout 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"
tools:context=".MainActivity" >

<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/a" />

</RelativeLayout>

activity_splash.xml

<RelativeLayout 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"
tools:context=".MainActivity" >

<android.support.v4.view.ViewPager

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

<Button
android:id="@+id/btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="30dp"
android:visibility="gone"
android:text="进入主页面">
</Button>

</RelativeLayout>

activity_main.xml

<RelativeLayout 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"
tools:context=".MainActivity" >

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />

</RelativeLayout>

WelcomeActivity.java

package com.cqc.guidedemo01;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;

public class WelcomeActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_welcome);

Message msg = Message.obtain();
handler.sendEmptyMessageDelayed(0, 3000);

}

public Handler handler = new Handler(){
public void handleMessage(android.os.Message msg) {
if (msg.what == 0) {
boolean is_First = getSharedPreferences("config", MODE_PRIVATE).getBoolean("is_First", true);
if (is_First) {
Intent intent = new Intent(getBaseContext(), SplashActivity.class);
startActivity(intent);
} else {
Intent intent = new Intent(getBaseContext(), MainActivity.class);
startActivity(intent);
}
finish();
}
};
};
}

SplashActivity.java

package com.cqc.guidedemo01;

import java.util.ArrayList;

import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences.Editor;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;

public class SplashActivity extends Activity {

private ArrayList<ImageView> list;
private Button btn;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splash);

initIsFirst();

initData();

btn = (Button) findViewById(R.id.btn);

ViewPager viewpager = (ViewPager) findViewById(R.id.viewpager);
MyAdapter adapter = new MyAdapter();
viewpager.setAdapter(adapter);

viewpager.setOnPageChangeListener(new OnPageChangeListener() {

@Override
public void onPageSelected(int position) {
if (position == list.size() - 1) {
btn.setVisibility(View.VISIBLE);
btn.setOnClickListener(new Button.OnClickListener() {

@Override
public void onClick(View v) {
Intent intent = new Intent(getBaseContext(),
MainActivity.class);
startActivity(intent);
finish();
}
});
} else {
btn.setVisibility(Button.GONE);
}
}

@Override
public void onPageScrolled(int position, float positionOffset,
int positionOffsetPixels) {

}

@Override
public void onPageScrollStateChanged(int state) {

}
});

}

private void initIsFirst() {
Editor edit = getSharedPreferences("config", MODE_PRIVATE).edit();
edit.putBoolean("is_First", false);
edit.commit();
}

private void initData() {
list = new ArrayList<ImageView>();

ImageView iv1 = new ImageView(getBaseContext());
iv1.setBackgroundResource(R.drawable.b);
list.add(iv1);

ImageView iv2 = new ImageView(getBaseContext());
iv2.setBackgroundResource(R.drawable.c);
list.add(iv2);

ImageView iv3 = new ImageView(getBaseContext());
iv3.setBackgroundResource(R.drawable.d);
list.add(iv3);

}

class MyAdapter extends PagerAdapter {

@Override
public int getCount() {
return list.size();
}

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

@Override
public Object instantiateItem(ViewGroup container, int position) {
container.addView(list.get(position));
return list.get(position);
}

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

}

MainActivity.java

package com.cqc.guidedemo01;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}

@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;
}

}

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