文件结构
这里写图片描述

运行效果
这里写图片描述

主要代码
MainActivity

package cn.edu.sicnu.dialogdemo;

import android.app.DialogFragment;
import android.content.DialogInterface;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements MyInterface {

@Override
protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);
}public void showdialog1(View view){AlertDialog.Builder builder = new AlertDialog.Builder(this);builder.setTitle("dialog 1");builder.setMessage("please choose yes or no?");builder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialogInterface, int i) {Toast.makeText(MainActivity.this, "yes",Toast.LENGTH_SHORT).show();}});builder.setNegativeButton("No", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialogInterface, int i) {Toast.makeText(MainActivity.this, "no",Toast.LENGTH_SHORT).show();}});builder.show();
}public void showdialog2(View view){MyDialog myDialog = new MyDialog();myDialog.show(getFragmentManager(),"dialog2");}@Override
public void buttonYesClicked() {Toast.makeText(MainActivity.this, "I am acticity , yes",Toast.LENGTH_SHORT).show();}@Override
public void buttonNoClicked() {Toast.makeText(MainActivity.this, "I am acticity , No",Toast.LENGTH_SHORT).show();}public void showdialog3(View view){AlertDialog.Builder builder = new AlertDialog.Builder(this);builder.setTitle("dialog 3");final View v =  getLayoutInflater().inflate(R.layout.dialoglayout,null);builder.setView(v);builder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialogInterface, int i) {EditText editText_username = v.findViewById(R.id.username);Toast.makeText(MainActivity.this, "username:"+ editText_username.getText(),Toast.LENGTH_SHORT).show();}});builder.setNegativeButton("No", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialogInterface, int i) {Toast.makeText(MainActivity.this, "no",Toast.LENGTH_SHORT).show();}});builder.show();}

}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
MyDialog

package cn.edu.sicnu.dialogdemo;

import android.annotation.SuppressLint;
import android.app.Dialog;
import android.app.DialogFragment;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.widget.Toast;

public class MyDialog extends DialogFragment {

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());builder.setTitle("dialog 1");builder.setMessage("please choose yes or no?");builder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialogInterface, int i) {MyInterface myInterface = (MyInterface)getActivity();myInterface.buttonYesClicked();}});builder.setNegativeButton("No", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialogInterface, int i) {MyInterface myInterface = (MyInterface)getActivity();myInterface.buttonNoClicked();}});return builder.create();
}

}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
MyInterface

package cn.edu.sicnu.dialogdemo;

public interface MyInterface {
public void buttonYesClicked();
public void buttonNoClicked();

}
1
2
3
4
5
6
7
8
activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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="cn.edu.sicnu.dialogdemo.MainActivity">

<Buttonandroid:id="@+id/button"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginTop="2dp"android:onClick="showdialog1"android:text="Show Dialog"app:layout_constraintLeft_toLeftOf="parent"app:layout_constraintRight_toRightOf="parent"app:layout_constraintTop_toTopOf="parent" /><Buttonandroid:id="@+id/button2"android:layout_width="wrap_content"android:layout_height="wrap_content"android:onClick="showdialog2"android:text="Show MyDialog"app:layout_constraintLeft_toLeftOf="parent"app:layout_constraintRight_toRightOf="parent"app:layout_constraintTop_toBottomOf="@+id/button" /><Buttonandroid:id="@+id/button3"android:layout_width="wrap_content"android:layout_height="wrap_content"android:onClick="showdialog3"android:text="Show Login"app:layout_constraintLeft_toLeftOf="parent"app:layout_constraintRight_toRightOf="parent"app:layout_constraintTop_toBottomOf="@+id/button2" /><Buttonandroid:id="@+id/button4"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="Button"app:layout_constraintLeft_toLeftOf="parent"app:layout_constraintRight_toRightOf="parent"app:layout_constraintTop_toBottomOf="@+id/button3" />

</android.support.constraint.ConstraintLayout>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
dialoglayout.xml

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

<EditTextandroid:id="@+id/username"android:layout_width="match_parent"android:layout_height="wrap_content"android:ems="10"android:inputType="textPersonName"android:hint="username?"android:text="" />
<EditTextandroid:id="@+id/password"android:layout_width="match_parent"android:layout_height="wrap_content"android:ems="10"android:hint="password?"android:inputType="textPassword" />

</LinearLayout>