俗話說 實踐出真知 所以 就直接上代碼啦

1院究、activity_main.xml

很基礎(chǔ) 沒什么好說的 順著寫就好

<?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=".MainActivity"
    android:orientation="vertical"
    tools:ignore="HardcodedText">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Hello World !"
        android:textSize="30sp"
        android:textColor="#159036" />

    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="普通對話框"
        android:textSize="25sp" />

    <Button
        android:id="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="單選對話框"
        android:textSize="25sp"/>

    <Button
        android:id="@+id/button3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="多選對話框"
        android:textSize="25sp"/>

    <Button
        android:id="@+id/button4"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="進度條加載"
        android:textSize="25sp"/>

    <Button
        android:id="@+id/button5"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="自定義彈窗"
        android:textSize="25sp"/>

</LinearLayout>

主界面.jpg

2沟娱、MainActivity.java

這里展示了5種彈窗(對話框) 的用法 但是大同小異
PS: 剛開始準備寫在一起 但是太丑了 我都看不下去 還是分開展示吧 好氣哦

0)主體

public class MainActivity extends AppCompatActivity {
    private final Context context = MainActivity.this;
    private Button button1;
    private Button button2;
    private Button button3;
    private Button button4;
    private Button button5;

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

        button1 = findViewById(R.id.button1);
        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                click1();
            }
        });

        button2 = findViewById(R.id.button2);
        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                click2();
            }
        });

        button3 = findViewById(R.id.button3);
        button3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                click3();
            }
        });

        button4 = findViewById(R.id.button4);
        button4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                click4();
            }
        });

        button5 = findViewById(R.id.button5);
        button5.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                click5();
            }
        });
    }
}

1)普通對話框

public void click1(){
    //new一個建立彈窗模板的方法
    AlertDialog.Builder builder = new AlertDialog.Builder(context);
    builder.setTitle("基礎(chǔ)彈窗");
    builder.setMessage("彈窗是否顯示成功？");
    builder.setNegativeButton("否", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            Toast.makeText(context, "啊 這募闲。笔喉。尸诽。", Toast.LENGTH_SHORT).show();
        }
    });
    builder.setPositiveButton("是", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            Toast.makeText(context, "彈窗顯示成功", Toast.LENGTH_SHORT).show();
        }
    });
    builder.show();
}

普通對話框展示.jpg

2)單選對話框

public void click2(){
    AlertDialog.Builder builder = new AlertDialog.Builder(context);
    builder.setTitle("請選擇你最喜歡的選項");
    final String items[] = {"A","B","C","D","E"};
    builder.setSingleChoiceItems(items, -1, new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            String item = items[which];
            Toast.makeText(getApplicationContext(),"你選擇了：" + item.toString(),Toast.LENGTH_SHORT).show();
            dialog.dismiss();
        }
    });
    builder.show();
}

單選對話框展示.jpg

3)多選對話框

public void click3(){
    AlertDialog.Builder builder = new AlertDialog.Builder(context);
    builder.setTitle("今天做了什么?");
    final String items[] = {"吃飯","學習","睡覺","打豆豆"};
    final boolean[] checkedItems = {false,true,false,false};
    builder.setMultiChoiceItems(items, checkedItems, new DialogInterface.OnMultiChoiceClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which, boolean isChecked) {}
    });
    builder.setPositiveButton("我選好了", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            StringBuffer sb = new StringBuffer();
            for (int i = 0; i < checkedItems.length; i++) {
                if(checkedItems[i]){
                String option = items[i];
                sb.append(option + " ");
            }
        }
        Toast.makeText(getApplicationContext(),"今天去 " + sb.toString() + "了",Toast.LENGTH_SHORT).show();
            dialog.dismiss();
        }
    });
    builder.show();
}

多選對話框.jpg

4)加載進度條

public void click4(){
    final ProgressDialog dialog = new ProgressDialog(context);
    dialog.setTitle("任務(wù)加載中...");
    dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

    new Thread(){ //創(chuàng)建一個子線程
        public void run(){
            dialog.setMax(100);
            for (int i = 0; i <= 100; i++) {
                dialog.setProgress(i);
                SystemClock.sleep(50);
            }
            dialog.dismiss();
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    Toast.makeText(getApplicationContext(),"加載成功",Toast.LENGTH_SHORT).show();
                    //可以同時設(shè)置多個view 或者發(fā)生消息（只允許運行在主線程的操作）
                    //安卓中的主線程叫UI線程 一個activity只允許有一個
                }
            });
        }
    }.start();
    dialog.show();
}

加載進度條展示.jpg

5)自定義彈窗

public void click5(){
    //new一個彈窗 并綁定布局
    View view1 = View.inflate(context,R.layout.layout_one,null);
    AlertDialog dialog = new AlertDialog.Builder(context)
        .setView(view1)
        .create();//只有這個方法的返回類型是 AlertDialog

    TextView textView = view1.findViewById(R.id.text1);
    //textView.setText("haha world!");
    dialog.setCanceledOnTouchOutside(false);//觸摸旁邊不會消失忽孽，但返回鍵會消失
    //dialog.setCancelable(false);//都不會消失
    dialog.show();        
}

自定義彈窗展示.jpg

3绑改、layout_one.xml

這個就是寫自定義彈窗的布局
PS: 鑒于本人水平太菜了 有些布局就強行加空格寫的 哈哈哈哈偷懶了偷懶了

<?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=".MainActivity"
    android:orientation="vertical"
    tools:ignore="HardcodedText">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

    <TextView
        android:id="@+id/text1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="  Hello world!"
        android:textSize="30sp"
        android:textColor="#159036"/>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

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

        <Button
            android:id="@+id/buttonX"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="嘻嘻"/>

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

        <Button
            android:id="@+id/buttonH"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="哈哈"/>
    </LinearLayout>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</LinearLayout>

大概就這么多了吧 還是那句話 實踐出真知! and 筆記都在注釋里!