一,簡單的對話框
<?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"
android:orientation="vertical"
tools:context="com.example.dfcn.myapplication.MainActivity"
>
<Button
android:id="@+id/btn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="最簡單的對話框"/>
</LinearLayout>
package com.example.dfcn.myapplication;
import android.content.DialogInterface;
import android.content.Intent;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
Button btn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn=findViewById(R.id.btn);
final AlertDialog.Builder dia=new AlertDialog.Builder(this);
dia.setIcon(R.mipmap.ic_launcher);//設置標題圖片
dia.setTitle("我是對話框");//設置對話框的標題
dia.setMessage("我是對話框的內容");//設置對話框的內容
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
dia.setNegativeButton("確定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
Toast.makeText(MainActivity.this, "你點擊了確定", Toast.LENGTH_SHORT).show();
dialogInterface.dismiss();
}
});
dia.setPositiveButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
Toast.makeText(MainActivity.this, "你點擊了取消", Toast.LENGTH_SHORT).show();
dialogInterface.dismiss();
}
}).create();
dia.show();
}
});
}
}
其效果如下:
二,列表對話框
final String[] items = {"項目1", "項目2", "項目3", "項目4"};
AlertDialog.Builder dialog = new AlertDialog.Builder(MainActivity.this);
dialog.setTitle("我是標題")
.setItems(items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
d("選擇: " + items[which]);
}
});
dialog.show();
列表對話框,用於顯示一個列表並進行單選。
這裏主要通過setItems函數爲對話框配置要顯示的列表和選擇時的回調函數,選擇後對話框自動消失
三,單選對話框
int select = 1; //表示單選對話框初始時選中哪一項
final String[] items = {"項目1", "項目2", "項目3", "項目4"};
AlertDialog.Builder dialog = new AlertDialog.Builder(MainActivity.this);
dialog.setTitle("我是標題")
.setSingleChoiceItems(items, select,
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
select = which;
d("選擇: " + items[select]);
}
})
.setPositiveButton("確定",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
if (select != -1) {
d("確定: " + items[select]);
}
}
});
dialog.show()
單選對話框,與列表對話框功能相似,主要區別是選擇後對話框是否消失。單選對話框可以反覆選擇,直到用戶點擊確定按鈕。
setSingleChoiceItems函數的第一個參數是要顯示的列表文本,第二個參數表示默認選中哪一項,下標從0開始。
四,多選對話框
private ArrayList<Integer> list = new ArrayList<>();
final String[] items = {"項目1", "項目2", "項目3", "項目4"};
final boolean selected[] = {false, true, false, false};
list.clear();
for (int i = 0, size = selected.length; i < size; ++i) {
if (selected[i]) {
list.add(i);
}
}
AlertDialog.Builder dialog = new AlertDialog.Builder(MainActivity.this);
dialog.setTitle("我是標題")
.setMultiChoiceItems(items, selected,
new DialogInterface.OnMultiChoiceClickListener() {
@Override
public void onClick(DialogInterface dialog, int which, boolean isChecked) {
if (isChecked) {
list.add(which);
} else {
list.remove(Integer.valueOf(which));
}
}
})
.setPositiveButton("確定",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
if (list.size() == 0) {
d("你什麼都沒選啊,小夥");
} else {
StringBuilder str = new StringBuilder();
for (int i = 0, size = list.size(); i < size; i++) {
str.append(items[list.get(i)]);
if (i < size - 1) {
str.append(", ");
}
}
d("你選中了: " + str.toString());
}
}
});
dialog.show();
setMultiChoiceItems函數
參數1:設置要顯示的文本列表items
參數2:和文本數據個數一致的boolean數組selected,selected[i]表示items[i]是否是選中狀態
參數3:選項被點擊時的回調函數,isChecked爲true表示選中;false表示取消