控件 - AlertDialog

AlertDialog 对话框

在当前界面弹出一个对话框，它在所有界面元素之上，可以屏蔽掉其它元素的交互能力。

示例代码

activity_com_alert_dialog.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=".chapter03.AlertDialogActivity"
    android:orientation="vertical">

    <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scrollbars="vertical">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

            <Button
                android:id="@+id/btn_makedialog"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="AlertDialog" />

        </LinearLayout>
    </ScrollView>

</LinearLayout>

AlertDialogActivity.java

public class AlertDialogActivity extends MyBaseActivity {

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

        Button btn_makedialog = findViewById(R.id.btn_makedialog);
        btn_makedialog.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AlertDialog.Builder dialog =
                        new AlertDialog.Builder(AlertDialogActivity.this);
                // 设置标题
                dialog.setTitle("This is Dialog");
                // 设置内容
                dialog.setMessage(" Message Content ");
                // 弹出后会点击屏幕或物理返回键不消失
                dialog.setCancelable(false);
                // 设置确定
                dialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(AlertDialogActivity.this,
                                "Clicked OK", Toast.LENGTH_SHORT).show();
                    }
                });
                // 设置否定
                dialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(AlertDialogActivity.this,
                                "Clicked Cancel", Toast.LENGTH_SHORT).show();
                    }
                });
                // 显示
                dialog.show();
            }
        });
    }
}