基础控件(Button,Edittext,ImageView,ProgressBar,ToolBar,AlertDialog,PopupWindow)

Button

触发事件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <Button
        android:id="@+id/btn"
        android:onClick="myClick"
        android:background="@drawable/btn_selector"
        android:backgroundTint="@color/btn_color_selector"
        android:layout_width="200dp"
        android:layout_height="100dp"/>

</LinearLayout>

package com.example.myapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MainActivity";

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

        Button btn = findViewById(R.id.btn);

        // 点击触发
//        btn.setOnClickListener(new View.OnClickListener() {
//            @Override
//            public void onClick(View view) {
//                Log.e(TAG, "onClick:");
//            }
//        });

        // 长按触发
        btn.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View view) {
                Log.e(TAG, "onLongClick:");
                return false; // 改为true时，执行onLongClick后不会执行onClick
            }
        });

        // 触摸事件
        btn.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent motionEvent) {
                Log.e(TAG, "onTouch:" + motionEvent.getAction());
                return false; // 改为true时，执行onTouch后不会执行onLongClick和onClick
            }
        });
    }

    public void myClick(View view) {
        Log.e(TAG, "onClick:");
    }
}

EditText

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:orientation="vertical"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <EditText
        android:id="@+id/et"
        android:hint="输入账号"
        android:inputType="number"
        android:drawableLeft="@drawable/ic_baseline_person_24"
        android:drawablePadding="20dp"
        android:paddingLeft="20dp"
        android:textColorHint="#95a1aa"
        android:layout_width="200dp"
        android:layout_height="100dp"/>

    <EditText
        android:hint="输入密码"
        android:inputType="textPassword"
        android:textColorHint="#95a1aa"
        android:layout_width="200dp"
        android:layout_height="100dp"/>

    <Button
        android:id="@+id/btn"
        android:text="获取账号"
        android:layout_width="200dp"
        android:layout_height="100dp"/>

</LinearLayout>

package com.example.myedittext;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "wmj";
    private EditText et;

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

        Button btn = findViewById(R.id.btn);
        et = findViewById(R.id.et);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String str = et.getText().toString();
                Log.e(TAG, "输入的账号为：" + str);
            }
        });
    }
}

ImageView

<ImageView
    android:src="@drawable/pic1"
    android:scaleType="centerInside"
    android:layout_width="200dp"
    android:layout_height="200dp"/>

<ImageView
    android:src="@drawable/pic2"
    android:maxHeight="300dp"
    android:maxWidth="300dp"
    android:adjustViewBounds="true"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>

ProgressBar

<ProgressBar
    android:id="@+id/pb"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>

<Button
    android:onClick="myClick"
    android:text="显示隐藏进度条"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>

<ProgressBar
    android:id="@+id/pb2"
    style="@style/Widget.AppCompat.ProgressBar.Horizontal"
    android:max="100"
    android:indeterminate="true"
    android:layout_width="300dp"
    android:layout_height="100dp"/>

<Button
    android:onClick="load"
    android:text="模拟下载"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>

package com.example.myprogressbar;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.ProgressBar;

public class MainActivity extends AppCompatActivity {

    private ProgressBar progressBar;
    private ProgressBar progressBar2;

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

        progressBar = findViewById(R.id.pb);
        progressBar2 = findViewById(R.id.pb2);
    }

    public void myClick(View view) {
        if(progressBar.getVisibility() == View.GONE){
            // 若隐藏则显示
            progressBar.setVisibility(View.VISIBLE);
        }else{
            progressBar.setVisibility(View.GONE);
        }
    }

    public void load(View view) {
        int progress = progressBar2.getProgress();
        progress += 10;
        progressBar2.setProgress(progress);
    }
}

ToolBar

• 在themes.xml中关闭toolbar：parent="Theme.MaterialComponents.DayNight.NoActionBar

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:layout_height="match_parent"
    android:layout_width="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <androidx.appcompat.widget.Toolbar
        android:id="@+id/tb"
        android:background="#ffff00"
        app:navigationIcon="@drawable/ic_baseline_arrow_back_24"
        app:title="主标题"
        app:titleTextColor="#ff0000"
        app:titleMarginStart="50dp"
        app:subtitle="子标题"
        app:subtitleTextColor="#00ff00"
        app:logo="@mipmap/ic_launcher"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"/>

    <androidx.appcompat.widget.Toolbar
        android:id="@+id/tb2"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:layout_marginTop="10dp"
        android:background="#ffff00"/>

    <androidx.appcompat.widget.Toolbar
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:layout_marginTop="10dp"
        app:navigationIcon="@drawable/ic_baseline_arrow_back_24"
        android:background="#ffff00">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:layout_gravity="center"
            android:text="标题"/>
    </androidx.appcompat.widget.Toolbar>
</LinearLayout>

package com.example.mytoolbar;

import androidx.annotation.RequiresApi;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;

import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.View;

public class MainActivity extends AppCompatActivity {

    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // 注意是import androidx.appcompat.widget.Toolbar;
        Toolbar toolbar = findViewById(R.id.tb);
        Toolbar toolbar2 = findViewById(R.id.tb2);

        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Log.e("wmj", "点击了导航栏返回按钮");
            }
        });

        toolbar2.setNavigationIcon(R.drawable.ic_baseline_arrow_back_24);
        toolbar2.setTitle("标题");
        toolbar2.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Log.e("wmj", "点了");
            }
        });
    }
}

AlertDialog

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:orientation="horizontal"
    android:background="#FFFF00"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@mipmap/ic_launcher"/>

    <TextView
        android:text="哈哈"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:orientation="vertical"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="显示对话框"
        android:onClick="myClick"/>
</LinearLayout>

package com.example.myalterdialog;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;

import android.content.DialogInterface;
import android.os.Bundle;
import android.util.Log;
import android.view.View;

public class MainActivity extends AppCompatActivity {

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

    public void myClick(View view) {

        View dialog_view = getLayoutInflater().inflate(R.layout.dialog_view, null);

        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setIcon(R.mipmap.ic_launcher)
                .setTitle("对话框")
                .setMessage("对话框内容")
                .setView(dialog_view)
                .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        Log.e("wmj", "确定");
                    }
                })
                .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        Log.e("wmj", "取消");
                    }
                })
                .setNeutralButton("中间", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        Log.e("wmj", "中间");
                    }
                }) // 以上返回的都是Builder，可以变换顺序
                .create() // 返回的是AlertDialog，不能放在前面
                .show();
    }
}

PopupWindow

popup_view.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:orientation="vertical"
    android:background="@mipmap/ic_launcher"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <Button
        android:id="@+id/btn1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="按钮1"
        android:padding="5dp"
        android:textSize="18sp"/>

    <Button
        android:id="@+id/btn2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="按钮2"
        android:padding="5dp"
        android:textSize="18sp"/>

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:orientation="horizontal"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="myClick"
        android:text="弹出窗口"/>
</LinearLayout>

package com.example.mypopupwindow;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.PopupWindow;

public class MainActivity extends AppCompatActivity {

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

    public void myClick(View view) {
        View popupview = getLayoutInflater().inflate(R.layout.popup_view, null);

        Button btn1 = popupview.findViewById(R.id.btn1);
        Button btn2 = popupview.findViewById(R.id.btn2);

        // 最后一个参数加上后，点击空白处popupwindow会消失
        PopupWindow popupWindow = new PopupWindow(popupview, ViewGroup.LayoutParams.WRAP_CONTENT,
                ViewGroup.LayoutParams.WRAP_CONTENT, true);

        popupWindow.setBackgroundDrawable(getResources().getDrawable(R.drawable.ic_baseline_airline_seat_recline_extra_24));

//        popupWindow.showAsDropDown(view);
        popupWindow.showAsDropDown(view, view.getWidth(), -view.getHeight());

        btn1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Log.e("wmj", "按钮1");
                popupWindow.dismiss();
            }
        });

        btn2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Log.e("wmj", "按钮2");
                popupWindow.dismiss();
            }
        });
    }
}