【Android】Android按钮点击事件

MainActivity

package com.example.administrator.android20200314;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        //全屏
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getSupportActionBar().hide();
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);

        setContentView(R.layout.activity_main);
        Button btn1 = (Button) findViewById(R.id.btn_open);
        Button btn_grid = (Button) findViewById(R.id.btn_grid);
        btn1.setOnClickListener(new View.OnClickListener(){  //点击按钮监听
            @Override
            public void onClick(View v){
                Intent i = new Intent(MainActivity.this,Main2Activity.class); //切换窗口
                startActivity(i);
            }
        });
        btn_grid.setOnClickListener(new View.OnClickListener(){
            @Override
            public  void onClick(View v){
                Intent g = new Intent(MainActivity.this,GridActivity.class);
                startActivity(g);
            }
        });
    }
}

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="com.example.administrator.android20200314.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
    <Button
        android:id="@+id/btn_open"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="打开窗口"/>
    <Button
        android:id="@+id/btn_grid"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="打开网格布局"/>
    <Button
        android:id="@+id/btn_selector"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="selector"
        android:background="@drawable/selector"/>

</LinearLayout>

Main2Activity

package com.example.administrator.android20200314;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Window;
import android.view.WindowManager;

public class Main2Activity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getSupportActionBar().hide();
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_main2);
    }
}

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"
    tools:context="com.example.administrator.android20200314.Main2Activity">

    <TextView
        android:id="@+id/text1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Activity 2"/>
</LinearLayout>

GridActivity

package com.example.administrator.android20200314;

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

public class GridActivity extends AppCompatActivity {

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