android实现仿QQ登陆界面的多账号保存
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android应用程序中有些使用到用户账号登录,例如QQ登录,登录界面需要用户输入账号,为了提高用户体验,应该尽量减少用户的输入操作,因此需要将用户登录过的账号保存下来,以供下次使用。保存登录账号是一个小量数据,使用Sharedpreferences或普通文件均可实现。以下程序代码保存用户使用过的5个账号。
程序运行界面:
布局文件(/res/layout/main.xml)
- <?xml version="1.0" encoding="utf-8"?>
- <RelativeLayout
- android:id="@+id/RelativeLayout1"
- xmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent">
- <TextView
- android:textAppearance="?android:attr/textAppearanceLarge"
- android:layout_height="wrap_content"
- android:layout_width="wrap_content"
- android:id="@+id/textView1"
- android:text="name:"
- android:gravity="center"
- android:layout_alignParentTop="true"
- android:layout_alignParentLeft="true"
- android:layout_alignBottom="@+id/name"></TextView>
- <EditText
- android:layout_height="wrap_content"
- android:layout_width="wrap_content"
- android:id="@+id/name"
- android:layout_alignParentTop="true"
- android:layout_alignParentRight="true"
- android:layout_toRightOf="@+id/textView2">
- <requestFocus></requestFocus>
- </EditText>
- <TextView
- android:textAppearance="?android:attr/textAppearanceLarge"
- android:layout_height="wrap_content"
- android:layout_width="wrap_content"
- android:id="@+id/textView2"
- android:text="password:"
- android:layout_below="@+id/name"
- android:layout_alignParentLeft="true"></TextView>
- <EditText
- android:layout_height="wrap_content"
- android:layout_width="wrap_content"
- android:id="@+id/password"
- android:layout_alignTop="@+id/textView2"
- android:layout_alignParentRight="true"
- android:layout_alignLeft="@+id/name"></EditText>
- <Button
- android:layout_height="wrap_content"
- android:layout_width="wrap_content"
- android:id="@+id/button2"
- android:text="Button"
- android:layout_below="@+id/password"
- android:layout_toLeftOf="@+id/button1"></Button>
- <Button
- android:layout_height="wrap_content"
- android:layout_width="wrap_content"
- android:id="@+id/button1"
- android:text="Button"
- android:layout_alignBaseline="@+id/button2"
- android:layout_alignBottom="@+id/button2"
- android:layout_alignParentRight="true"
- android:layout_marginRight="20dp"></Button>
- <ImageView
- android:layout_width="wrap_content"
- android:src="@drawable/array_down"
- android:layout_height="wrap_content"
- android:id="@+id/show"
- android:layout_alignParentTop="true"
- android:layout_alignParentRight="true"
- android:layout_alignBottom="@+id/name"></ImageView>
- </RelativeLayout>
java源文件(MainActivity.java)
- import java.io.FileOutputStream;
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.ObjectInputStream;
- import java.io.ObjectOutputStream;
- import java.util.ArrayList;
- import android.app.Activity;
- import android.os.Bundle;
- import android.view.View;
- import android.view.ViewGroup;
- import android.view.View.OnClickListener;
- import android.widget.AdapterView;
- import android.widget.ArrayAdapter;
- import android.widget.EditText;
- import android.widget.ImageView;
- import android.widget.ListView;
- import android.widget.PopupWindow;
- import android.widget.AdapterView.OnItemClickListener;
- import android.widget.PopupWindow.OnDismissListener;
- public class MainActivity extends Activity implements
- OnClickListener, OnItemClickListener, OnDismissListener {
- private ArrayList<String> mList = new ArrayList<String>();
- private EditText mEditText;
- private ImageView mImageView;
- private PopupWindow mPopup;
- private boolean mShowing;
- private ArrayAdapter<String> mAdapter;
- private ListView mListView;
- private boolean mInitPopup;
- /** Called when the activity is first created. */
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- mEditText = (EditText) findViewById(R.id.name);
- mImageView = (ImageView) findViewById(R.id.show);
- mImageView.setOnClickListener(this);
- init();
- }
- private void init() {
- ObjectInputStream in = null;
- try {
- InputStream is = openFileInput("account.obj");
- in = new ObjectInputStream(is);
- mList = (ArrayList<String>) in.readObject();
- if (mList.size() > 0) {
- mEditText.setText(mList.get(0));
mEditText.setSelection(mList.get(0).length()); - }
- } catch (Exception e) {
- e.printStackTrace();
- } finally {
- if (in != null) {
- try {
- in.close();
- } catch (IOException e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- }
- }
- }
- }
- @Override
- protected void onDestroy() {
- super.onDestroy();
- String input = mEditText.getText().toString();
- mList.remove(input);
- mList.add(input);
- if (mList.size() > 5) {
- mList.remove(5);
- }
- ObjectOutputStream out = null;
- try {
- FileOutputStream os = openFileOutput("account.obj",
- MODE_PRIVATE);
- out = new ObjectOutputStream(os);
- out.writeObject(mList);
- } catch (Exception e) {
- } finally {
- if (out != null) {
- try {
- out.close();
- } catch (IOException e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- }
- }
- }
- }
- @Override
- public void onClick(View v) {
- if (v.getId() == R.id.show) {
- if(mList!=null && mList.size()>0 && !mInitPopup){
- mInitPopup = true;
- initPopup();
- }
- if (mPopup != null) {
- if (!mShowing) {
- //这是为了防止下拉框与文本框之间产生缝隙,影响界面美化(注意适配的问题)
- mPopup.showAsDropDown(mEditText,0,-5);
- mShowing = true;
- } else {
- //mPopup.dismiss();
dismissPopWindow(); - }
- }
- }
- }
- private void initPopup() {
- mAdapter = new ArrayAdapter<String>(this,
- android.R.layout.simple_dropdown_item_1line, mList);
- mListView = new ListView(this);
- //mListView.setDividerHeight(1);
// mListView.setBackgroundResource(R.drawable.kge_feek_bg);
// mListView.setCacheColorHint(0x00000000); - mListView.setAdapter(mAdapter);
- mListView.setOnItemClickListener(this);
- int height = ViewGroup.LayoutParams.WRAP_CONTENT;
- int width = mEditText.getWidth();
- System.out.println(width);
- mPopup = new PopupWindow(mListView, width, height, true);
- mPopup.setOutsideTouchable(true);
- // TODO 背景的颜色待处理、
// mPopup.setBackgroundDrawable(getResources().getDrawable(R.drawable.popup_bg));
mPopup.setBackgroundDrawable(new ColorDrawable(Color.BLUE)); - mPopup.setOnDismissListener(this);
- }
- @Override
- public void onItemClick(AdapterView<?> parent, View view,
- int position, long id) {
- mEditText.setText(mList.get(position));
- mEditText.setSelection(mList.get(position).length());
- //mPopup.dismiss();
dismissPopWindow(); - }
- @Override
- public void onDismiss() {
- mShowing = false;
- }
- public void dismissPopWindow() {
if(mPopup != null && mPopup.isShowing()){
mPopup.dismiss();
}
} - // TODO Auto-generated method stub
- // private class SelectAdapter extends BaseAdapter{}
- }
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