启动页面

 

 

<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:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context="net.oschina.app.AppStart">

    <LinearLayout
        android:id="@+id/app_start_view"
        android:orientation="vertical"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:gravity="bottom"
        android:background="@drawable/welcome">
        <TextView android:text="@string/hello_world" android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
    </LinearLayout>


</RelativeLayout>

 

package net.oschina.app;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.widget.LinearLayout;

import net.oschina.app.ui.Main;

/**
 * 应用程序启动类
 */
public class AppStart extends Activity {

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

        final View view = View.inflate(this, R.layout.activity_app_start, null);
       // LinearLayout wellcome = (LinearLayout) view.findViewById(R.id.app_start_view);
        setContentView(view);

        //渐变展示启动屏
        AlphaAnimation aa = new AlphaAnimation(0.3f,1.0f);
        aa.setDuration(2000);
        view.startAnimation(aa);
        aa.setAnimationListener(new Animation.AnimationListener() {
            @Override
            public void onAnimationEnd(Animation arg0) {
                redirectTo();
            }

            @Override
            public void onAnimationRepeat(Animation animation) {
            }

            @Override
            public void onAnimationStart(Animation animation) {
            }

        });
    }


    /**
     * 跳转到...
     */
    private void redirectTo(){
        Intent intent = new Intent(this, Main.class);
        startActivity(intent);
        finish();
    }

}

1、创建新包

2、断点调试

3、Context上下文

/**
 * Interface to global information about an application environment.  This is
 * an abstract class whose implementation is provided by
 * the Android system.  It
 * allows access to application-specific resources and classes, as well as
 * up-calls for application-level operations such as launching activities,
 * broadcasting and receiving intents, etc.
 */
public abstract class Context