Android课程设计第六天欢迎界面（跳转）

package com.example.myapplication;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.TextView;

/**
 * Created by 樱花落舞 on 2017/6/13.
 */

public class JumpActivity extends Activity {
    TextView textView;
    int time=3;
    Handler handler=new Handler();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.jump);
        textView= (TextView) findViewById(R.id.textview);

        handler.postDelayed(runnable,1000);

    }

    Runnable runnable=new Runnable() {
        @Override
        public void run() {
            time--;
            handler.postDelayed(this,1000);
            textView.setText("+"+time+"s");

            if(time==0){
                Intent intent = new Intent(JumpActivity.this,TestActivity.class);
                startActivity(intent);
                finish();
            }else {
                textView.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Intent intent=new Intent(JumpActivity.this,TestActivity.class);
                        startActivity(intent);
                        //结束线程
                        handler.removeCallbacks(runnable);
                        finish();
                    }
                });
            }
        }
    };
}

package com.example.myapplication;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        intent.setClass(MainActivity.this,JumpActivity.class);
        startActivity(intent);
        MainActivity.this.finish();
    }
    Intent intent = new Intent();
}

package com.example.myapplication;

import android.app.Activity;
import android.os.Bundle;
import android.support.annotation.Nullable;

/**
 * Created by 樱花落舞 on 2017/6/13.
 */

public class TestActivity extends Activity {
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.empty_activity);
    }
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.myapplication.MainActivity"

    android:orientation="vertical">
    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@mipmap/bg"/>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="+3秒"
        android:id="@+id/text"
        android:textSize="20dp"
        android:layout_alignParentRight="true"/>


</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:layout_height="match_parent">
   <TextView
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:background="@mipmap/a"/>
</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:layout_height="match_parent"
    android:orientation="vertical">
    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@mipmap/bg"/>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/textview"
        android:textSize="20sp"
        android:text="+3s"
        android:layout_alignParentRight="true"/>
</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.myapplication">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".JumpActivity"
            android:label="@string/app_name"
        >
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value=".MainActivity"/>
        </activity>
        <activity android:name=".TestActivity"
            android:label="@string/app_name">
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value=".MainActivity"/>


        </activity>
    </application>

</manifest>