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android中的下拉菜單聯動應用非常普遍，android中的下拉菜單用Spinner就能實現，以下列子通過簡單的代碼實現三級菜單聯動。
一 樣式文件
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.spinner.MainActivity" >
<Spinner android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/spn"
android:dropDownWidth="200dp"/>
<Spinner android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/spn"
android:id="@+id/city"
android:dropDownWidth="200dp"/>
<Spinner android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/city"
android:id="@+id/counstryside"
android:dropDownWidth="200dp"/>
</RelativeLayout>
二 聯動邏輯代碼
package com.example.spinner;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
/**
* @author ZMC
* 三級聯動主要是靈活的應用三維數組
*/
public class MainActivity extends Activity {
private String province[] = new String[]{"江西","湖南"};
private Spinner spinner1,spinner2,spinner3;
private int provinceindex;
private String city [][] = {{"南昌","贛州"},{"長沙","湘潭"}};
private String counstryside [][][] = {{{"青山湖區","南昌縣"},{"章貢區","贛縣"}},{{"長沙縣","沙縣"},{"湘潭縣","象限"}}};
ArrayAdapter<String> adapter1,adapter2,adapter3;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
spinner1 = (Spinner) findViewById(R.id.spn);
adapter1 = new ArrayAdapter<>(this, android.R.layout.simple_dropdown_item_1line,province);
spinner1.setAdapter(adapter1);
spinner2 = (Spinner)findViewById(R.id.city);
adapter2 = new ArrayAdapter<>(this, android.R.layout.simple_dropdown_item_1line,city[0]);
spinner2.setAdapter(adapter2);
spinner3 = (Spinner)findViewById(R.id.counstryside);
adapter3 = new ArrayAdapter<>(this, android.R.layout.simple_dropdown_item_1line,counstryside[0][0]);
spinner3.setAdapter(adapter3);
spinner1.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
provinceindex = position;
adapter2 = new ArrayAdapter<>(MainActivity.this, android.R.layout.simple_dropdown_item_1line,city[position]);
spinner2.setAdapter(adapter2);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
// TODO Auto-generated method stub
}
});
spinner2.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
adapter3 = new ArrayAdapter<>(MainActivity.this, android.R.layout.simple_dropdown_item_1line,counstryside[provinceindex][position]);
//adapter3.notifyDataSetChanged();
spinner3.setAdapter(adapter3);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
// TODO Auto-generated method stub
//當時據為空的時候觸發的
}
});
}
}
三 結果
四 總結
三級聯動主要是靈活的應用三維數組，這樣能很方便的通過數組索引將三個菜單關聯，同時通過設置Spinner的setOnItemSelectedListener來監聽選擇的動作，動態設置下拉菜單的內容。
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