安卓课程练习代码

项目 ActivityLife

layout部分：

activity_01.xml

<?xml version="1.0" encoding="utf-8"?>
<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=".Activity01">


    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:onClick="click"
        android:text="开启Activity02"/>
</RelativeLayout>

activity_02.xml

<?xml version="1.0" encoding="utf-8"?>
<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=".Activity02">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="Hello World!"/>
</RelativeLayout>

java代码部分：

Activity01.java

package com.example.hzg.activity;


import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;


public class Activity01 extends AppCompatActivity {


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_01);
        Log.i("Activity01","onCreate()");
    }
    protected void onStart() {
        super.onStart();
        Log.i("Activity01","onStart()");
    }
    protected void onRestart(){
        super.onRestart();
        Log.i("Activity01","onRestart()");
    }
    protected void onResume(){
        super.onResume();
        Log.i("Activity01","onResume()");
    }
    protected void onPause(){
        super.onPause();
        Log.i("Activity01","onPause()");
    }
    protected void onStop(){
        super.onStop();
        Log.i("Activity01","onStop()");
    }
    protected void onDestroy(){
        super.onDestroy();
        Log.i("Activity01","onDestroy()");
    }
    public void click(View view){
        Intent intent=new Intent(this,Activity02.class);
        startActivity(intent);
    }
}

activity02.java

package com.example.hzg.activity;


import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;


public class Activity02 extends AppCompatActivity {


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_02);
        Log.i("Activity02","onCreate()");
    }
    protected void onStart(){
        super.onStart();
        Log.i("Activity02","onStart()");
    }
    protected void onRestart(){
        super.onRestart();
        Log.i("Activity02","onRestart()");
    }
    protected void onResume(){
        super.onResume();
        Log.i("Activity02","onResume()");
    }
    protected void onPause(){
        super.onPause();
        Log.i("Activity02","onPause()");
    }
    protected void onStop(){
        super.onStop();
        Log.i("Activity02","onStop()");
    }
    protected void onDestroy(){
        super.onDestroy();
        Log.i("Activity02","onDestroy()");
    }
}