现在很多的登录界面都有记住账号的的这个功能,在点击输入账号的时候会出现一个列表供用户选择。点击其中的条目后会自动把信息填充到文本框当中。
然后我用PopupWindow组件实现了一个点击更多按钮实现更多列表的一个功能,这个下拉更多列表的效果如下:
接下来我们就开始一步一步的实现下拉更多列表功能。
1、首先新建一个对话框,布局文件login_layout.xml如下:`
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@android:color/background_light"
android:orientation="vertical" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="50dp" >
<TextView
android:id="@+id/xygame_login_title_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="登录"
android:textSize="20sp" />
</RelativeLayout>
<View
android:layout_width="match_parent"
android:layout_height="0.1dp"
android:background="@android:color/darker_gray" />
<TextView
android:id="@+id/xygame_login_accountPrompt_tv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:paddingLeft="10dp"
android:text="请登录"
android:textSize="15sp" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:paddingLeft="10dp"
android:paddingRight="10dp" >
<LinearLayout
android:id="@+id/login_account_ll"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<EditText
android:id="@+id/login_account_et"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_margin="0.1dp"
android:layout_weight="1"
android:hint="用户名/手机号"
android:singleLine="true"
android:textSize="15sp" />
<RelativeLayout
android:id="@+id/login_down_more_rl"
android:layout_width="50dp"
android:layout_height="match_parent" >
<ImageView
android:id="@+id/login_down_more_iv"
android:background="@drawable/down_more_icon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true" />
</RelativeLayout>
</LinearLayout>
<EditText
android:id="@+id/login_password_et"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="0.1dp"
android:gravity="center_vertical"
android:hint="请输入密码"
android:inputType="textPassword"
android:singleLine="true"
android:textSize="15dp" />
<Button
android:id="@+id/login_in_btn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:text="登录"
android:textColor="#ffffff"
android:textSize="15sp" />
</LinearLayout>
</LinearLayout>
2、继承自DialogFragment实现一个对话框,并把 布局文件加进去
<pre name="code" class="java">import java.util.ArrayList;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.DialogFragment;
import android.content.Context;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.PopupWindow;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.LinearLayout.LayoutParams;
import android.widget.PopupWindow.OnDismissListener;
@SuppressLint("NewApi")
public class LoginDialog extends DialogFragment implements OnClickListener{
private View mDialog;
private ImageView mMoreAccountIV;//更多列表的图标
private RelativeLayout mMoreAccountRL;//更多账号的RelativeLayout
private LinearLayout moreAccountParentView;
private LinearLayout mMoreAccountLL;
private int mAccountPopWidth; //账号列表的长度
private ListView mAccountListView; //更多列表的listview
private PopupWindow mAccountPopWindow;
private AccountAdapter mAdapter;
private Button mLoginBtn;
private EditText mAccountET,mPasswordET;
private ArrayList<String> mAccountData;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
getDialog().requestWindowFeature(Window.FEATURE_NO_TITLE);
mDialog = inflater.inflate(R.layout.login_layout, null);
initView();
initData();
return mDialog;
}
/**
* 初始化数据
*/
private void initData() {
//当以前有登录过的话则显示更多按钮
mAccountData = new ArrayList<String>();
mAccountData.add("123456");
mAccountData.add("12345");
mAccountData.add("1234");
mAccountData.add("123");
if (mAccountData.size() > 0) {
mMoreAccountRL.setVisibility(View.VISIBLE);
}else {
mMoreAccountRL.setVisibility(View.GONE);
}
}
private void initView() {
mLoginBtn = (Button) mDialog.findViewById(R.id.login_in_btn);
mMoreAccountRL = (RelativeLayout) mDialog.findViewById(R.id.login_down_more_rl);
mMoreAccountLL = (LinearLayout) mDialog.findViewById(R.id.login_account_ll);
mMoreAccountIV = (ImageView) mDialog.findViewById(R.id.login_down_more_iv);
mAccountET = (EditText) mDialog.findViewById(R.id.login_account_et);
mPasswordET = (EditText) mDialog.findViewById(R.id.login_password_et);
mLoginBtn.setOnClickListener(this);
mMoreAccountRL.setOnClickListener(this);
}
/**
* 初始化更多列表
*/
private void initWidget() {
//没有在initData有账号的时候就初始化更多列表是因为那个时候无法获取账号列表的长度
if (mAdapter == null) {
mAdapter = new AccountAdapter(getActivity(),mAccountData);
}
//设置在更多列表里的Listview
mAccountListView = new ListView(getActivity());
LayoutParams moreParam = new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
mAccountListView.setLayoutParams(moreParam);
moreAccountParentView = new LinearLayout(getActivity());
LayoutParams params = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
moreAccountParentView.setLayoutParams(params);
moreAccountParentView.addView(mAccountListView);
mAccountListView.setAdapter(mAdapter);
if (mAccountPopWindow == null){
mAccountPopWidth = mMoreAccountLL.getWidth();
mAccountPopWindow = new PopupWindow(moreAccountParentView, mAccountPopWidth, ViewGroup.LayoutParams.WRAP_CONTENT,true);
}
initPopupWindowHeight();
mAccountPopWindow.setOutsideTouchable(false);
mAccountPopWindow.setBackgroundDrawable(new BitmapDrawable());
}
/**
* 设置显示下拉高度 为三个item高度
*/
private void initPopupWindowHeight() {
// 获取ListView对应的Adapter
ListAdapter listAdapter = mAccountListView.getAdapter();
if (listAdapter == null) {
return;
}
int totalHeight = 0;
ViewGroup.LayoutParams params = mAccountListView.getLayoutParams();
View listItem = listAdapter.getView(0, null, mAccountListView);
listItem.measure(0, 0); // 计算子项View 的宽高
totalHeight += (listItem.getMeasuredHeight()) * 3; // 3个item的总高度
params.height = totalHeight
+ (mAccountListView.getDividerHeight() * (listAdapter.getCount() - 1));
// listView.getDividerHeight()获取子项间分隔符占用的高度
// params.height最后得到整个ListView完整显示需要的高度
mAccountListView.setLayoutParams(params);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.login_down_more_rl: //点击下拉更多按钮
initWidget();
showList();
mMoreAccountIV.setBackgroundResource(R.drawable.pull_icon);
break;
case R.id.login_in_btn: //点击登录
break;
}
}
/**
* 显示列表
*/
private void showList() {
mAccountPopWindow.showAsDropDown(mMoreAccountLL, 0, 0);
mAccountPopWindow.setOnDismissListener(new OnDismissListener() {
@Override
public void onDismiss() {
mMoreAccountIV.setBackgroundResource(R.drawable.down_more_icon);
}
});
}
/**
* dp转化成px
*/
private int dip2px(Context context, float dpValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}
private class AccountAdapter extends BaseAdapter{
private ArrayList<String> mMoreAccountList;
private Activity mActivity;
public AccountAdapter(Activity activity, ArrayList<String> moreAccount) {
mActivity = activity;
mMoreAccountList = moreAccount;
}
@Override
public int getCount() {
return mMoreAccountList.size();
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
MoreAccountHolder mHolder;
if (convertView == null) {
mHolder = new MoreAccountHolder();
LinearLayout mainLinearLayout = new LinearLayout(mActivity);
// mainLinearLayout.setBackgroundResource();
LinearLayout mainLayout = new LinearLayout(mActivity);
LinearLayout.LayoutParams mainParams = new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
mainLayout.setBackgroundResource(android.R.color.white);
//account text
TextView itemText = new TextView(mActivity);
LinearLayout.LayoutParams textParams = new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT, 1);
textParams.setMargins(dip2px(getActivity(),6) ,
dip2px(getActivity(),6), 0,dip2px(getActivity(),6));
itemText.setTextSize(12);
itemText.setPadding(dip2px(getActivity(),10) , 0, 0, 0);
mainLayout.addView(itemText, textParams);
//delete icon
ImageView deleteIcon = new ImageView(mActivity);
LinearLayout.LayoutParams iconParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
iconParams.gravity = Gravity.CENTER;
iconParams.setMargins(0, 0, dip2px(getActivity(),30), 0);
deleteIcon.setBackgroundResource(R.drawable.delete_icon);//设置删除图标
mainLayout.addView(deleteIcon, iconParams);
mainLinearLayout.addView(mainLayout, mainParams);
convertView = mainLinearLayout;
mHolder.popupAccountContent = itemText;
mHolder.popupAccountDelete = deleteIcon;
convertView.setTag(mHolder);
}else{
mHolder = (MoreAccountHolder) convertView.getTag();
}
mHolder.popupAccountContent.setText(mMoreAccountList.get(position));
mHolder.popupAccountContent.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mAccountET.setText(mMoreAccountList.get(position));
mPasswordET.setText("123456");
mAccountPopWindow.dismiss();
}
});
//点击删除icon的时候操作 这个时候最好是显示一个删除的对话框
mHolder.popupAccountDelete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mMoreAccountList.remove(position);
}
});
return convertView;
}
class MoreAccountHolder {
TextView popupAccountContent;
ImageView popupAccountDelete;
}
}
}
3、MainActivity如下:
import android.os.Bundle;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity {
private Button showDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
showDialog = (Button) findViewById(R.id.showDialog);
showDialog.setOnClickListener(new OnClickListener() {
@SuppressLint("NewApi") @Override
public void onClick(View v) {
LoginDialog dialog = new LoginDialog();
dialog.show(getFragmentManager(), "LoginDialog");
}
});
}
}