安卓之活动1

创建活动：

image.png

activity_main.xml:


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context="bluelesson.com.my_acitivty_launchmode.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="50sp"
        android:text="第一个界面"
       />

    <Button
        android:textSize="20sp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="onClickMy"
        android:text="创建自己"/>
    <Button
        android:textSize="20sp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="onClick2"
        android:text="创建第二个界面"/>
</LinearLayout>

activity_main2.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context="com.example.bluelesson.my_activity00.Main2Activity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="50sp"
        android:text="第二个界面"
        />

    <Button
        android:textSize="20sp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="onClickMy"
        android:text="创建自己"/>
    <Button
        android:textSize="20sp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="onClick1"
        android:text="创建第一个界面"/>


</LinearLayout>

MainActivity:
package com.example.bluelesson.my_activity00;

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

public class MainActivity extends AppCompatActivity {
private  String  TAG = "MainActivity";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Log.e(TAG,"onCreate");//打印错误信息
    }
    public void onClickMy(View view){
        Intent intent = new Intent(MainActivity.this,MainActivity.class);
        startActivity(intent);
    }

    public  void onClick2(View view){
        Intent intent = new Intent(MainActivity.this,Main2Activity.class);
        startActivity(intent);

    }
        //停止

    @Override
    protected void onStop() {
        super.onStop();
        Log.e(TAG,"onStop");
    }
    //销毁


    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.e(TAG,"onDestroy");
    }

    @Override
    protected void onStart() {
        super.onStart();
        Log.e(TAG,"onStart");
    }

    @Override
    protected void onRestart() {
        super.onRestart();
        Log.e(TAG,"onRestart");
    }

    @Override
    protected void onPause() {
        super.onPause();
        Log.e(TAG,"onPause");

    }

    @Override
    protected void onResume() {
        super.onResume();
        Log.e(TAG,"onResume");
    }
}

Main2Activity:
package com.example.bluelesson.my_activity00;

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

public class Main2Activity extends AppCompatActivity {
    private String TAG = "Main2Activity";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        Log.e(TAG,"onCreate");
    }
    //创建自己
    public void onClickMy(View view){
       Intent intent = new Intent(Main2Activity.this,Main2Activity.class);
        startActivity(intent);
    }


//创建第一个界面
public void onClick1(View view) {
    Intent intent = new Intent(Main2Activity.this,MainActivity.class);
    startActivity(intent);
}

    //停止
    @Override
    protected void onStop() {
        super.onStop();
        Log.e(TAG,"onStop");
    }

    //销毁
    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.e(TAG,"onDestroy");
    }

    @Override
    protected void onRestart() {
        super.onRestart();
        Log.e(TAG,"onRestart");
    }

    @Override
    protected void onStart() {
        super.onStart();
        Log.e(TAG,"onStart");
    }

    @Override
    protected void onPause() {
        super.onPause();
        Log.e(TAG,"onPause");
    }


    @Override
    protected void onResume() {
        super.onResume();
        Log.e(TAG,"onResume");
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        Log.e(TAG,"onTouchEvent");
        return super.onTouchEvent(event);
    }
}