自定义对话框

第二步：获取layoutInflater对象
第三步：调用inflater()方法获取View对象
第四步：调用Builder对象的setView()方法设置View
第五步：获取输入内容或者监听事件等

public class MainActivity extends AppCompatActivity {

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

    Dialog dialog;

    public void onclick(View v) {
        LayoutInflater inflater = LayoutInflater.from(this);
        View myview = inflater.inflate(R.layout.active_main_two, null);//引用自定义布局
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setView(myview);
        dialog = builder.create();//创建对话框
        dialog.show();//显示对话框
        myview.findViewById(R.id.but).setOnClickListener(new View.OnClickListener() {//获取布局里面按钮
            @Override
            public void onClick(View v) {
                dialog.dismiss();//点击按钮对话框消失
                Toast.makeText(MainActivity.this, "点击了残忍离开", Toast.LENGTH_SHORT).show();
            }
        });
    }

}

<?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">
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="对话框"
        android:onClick="onclick"/>
</LinearLayout>

<?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">
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="提示"

        android:textSize="28sp"/>
    <TextView
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:gravity="center"
        android:text="你真的要离开吗"
        android:textColor="#ff0400"

        android:textSize="28sp"/>
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="50sp"
        android:orientation="horizontal"

        android:gravity="center">
        <Button
            android:id="@+id/but"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="残忍离开"
            android:textSize="24sp"/>
    </LinearLayout>

</LinearLayout>