底部弹出PopupWindow+地址三级联动，多问题全面分析，详细注释

主要功能：从底部弹出的 PopupWindow，带动画，带灰色背景，在PopupWindow中实现省市区三级联动，并填充textview

先看效果图



1.PopupWindow

<span style="font-size:18px;">public class PopHelper {

private Context mContext;
private PopupWindow pw;
private CityPicker cityPicker;

public PopHelper(Context context) {
mContext = context;
}

/**
* @param view
* @param itemsOnClick 抛出一个OnClickListener接口
*/
public void showAddressPop(View view, final Activity activity, View.OnClickListener itemsOnClick) {
// 设置pw里的点击事件
LinearLayout addressView = (LinearLayout) View.inflate(mContext, R.layout.pop_address, null);
Button btnPopAddressCencel = (Button) addressView.findViewById(R.id.btn_pop_address_cencel);
btnPopAddressCencel.setOnClickListener(itemsOnClick);
Button btnPopAddressEnter = (Button) addressView.findViewById(R.id.btn_pop_address_enter);
btnPopAddressEnter.setOnClickListener(itemsOnClick);
cityPicker = (CityPicker) addressView.findViewById(R.id.citypicker);
//-2是包裹自己，-1是填充父容器
pw = new PopupWindow(addressView, -1, -2);
//先关闭
colsePopupwindow();
//必须要设置一个背景
pw.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
//点击外边可关闭pw
pw.setOutsideTouchable(true);
//pw内可获取焦点
pw.setFocusable(true);
// 设置背景颜色变暗
WindowManager.LayoutParams lp = activity.getWindow().getAttributes();
lp.alpha = 0.7f;
activity.getWindow().setAttributes(lp);
//退出时恢复透明度
pw.setOnDismissListener(new PopupWindow.OnDismissListener() {

@Override
public void onDismiss() {
WindowManager.LayoutParams lp = activity.getWindow().getAttributes();
lp.alpha = 1f;
activity.getWindow().setAttributes(lp);
}
});
//设置动画
pw.setAnimationStyle(R.style.take_photo_anim);
//显示。y轴距离底部100是因为部分手机有虚拟按键，所以实际项目中要动态设置
pw.showAtLocation(view, Gravity.BOTTOM, 0, 100);
}

/**
*
* @return 获取控件中的地址数据
*/
public String getAddressData() {
String cData = cityPicker.getCity_string();
return cData;
}

/**
* 关闭pw
*/
public void colsePopupwindow() {
if (pw != null && pw.isShowing()) {
pw.dismiss();
pw = null;
}
}

}</span>

2.pop的弹出退出动画

pop_enter_anim.xml

<span style="font-size:18px;"><?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">

<translate
android:duration="200"
android:fromYDelta="100%p"
android:toYDelta="0" />
<alpha
android:duration="200"
android:fromAlpha="0.0"
android:toAlpha="1.0" />
</set></span>

pop_exit_anim.xml

<span style="font-size:18px;"><?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate
android:duration="200"
android:fromYDelta="0"
android:toYDelta="50%p" />
<alpha
android:duration="200"
android:fromAlpha="1.0"
android:toAlpha="0.0" />
</set> </span>

记得copy  styles文件中的style

3.在MainActivity中的调用

<span style="font-size:18px;">public class MainActivity extends AppCompatActivity implements View.OnClickListener {

private TextView textView1, textView2;
c2ca
private Button button1, button2;
private PopHelper popHelper;//pop

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView1 = (TextView) findViewById(R.id.textView1);
textView2 = (TextView) findViewById(R.id.textView2);
button1 = (Button) findViewById(R.id.button1);
button1.setOnClickListener(this);
button2 = (Button) findViewById(R.id.button2);
button2.setOnClickListener(this);
}

/**
* 实现popHelper中的item接口
*/
private View.OnClickListener onClickListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_pop_address_cencel:
popHelper.colsePopupwindow();
break;
case R.id.btn_pop_address_enter:
String addressData = popHelper.getAddressData();
if (flag) {
textView1.setText(addressData);
} else {
textView2.setText(addressData);
}
popHelper.colsePopupwindow();
break;
}
}
};

boolean flag;//用于pop标记显示,避免多个地方显示却只填充一个textview的情况

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.button1:
popHelper = new PopHelper(getApplicationContext());
popHelper.showAddressPop(v, MainActivity.this, onClickListener);
flag = true;
break;
case R.id.button2:
popHelper = new PopHelper(getApplicationContext());
popHelper.showAddressPop(v, MainActivity.this, onClickListener);
flag = false;
break;
}
}
}</span>

4.地址三级联动

首先，在main目录下创建assets文件，并copy城市json数据包

其次，在lib中加入gson包，记得As a lib，或直接

<span style="font-size:18px;">compile 'com.google.code.gson:gson:2.6.2'</span>

然后，修改布局中的控件名称换成自己的包名+自定义类名

最后在values文件夹中copy-attrs.xml文件

然后就完美实现了。

代码中都有详细注释

源码下载地址：https://github.com/yechaoa/PopAddress