Android实验六之登录页面记住密码

实验结果：（未成功）

代码：

 

mainactivity.java

package com.example.password;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class MainActivity extends Activity{@Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Button forceoffline = (Button) findViewById(R.id.force_offline);forceoffline.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubIntent intent = new Intent("com.example.broadcastbestpractice.FORCE_OFFLINE");sendBroadcast(intent);}});}@Overridepublic boolean onCreateOptionsMenu(Menu menu){// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}}

LoginActivity.java

package com.example.password;import android.app.Activity;import android.content.Intent;import android.content.SharedPreferences;import android.os.Bundle;import android.preference.PreferenceManager;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.CheckBox;import android.widget.EditText;import android.widget.Toast;public class LoginActivity extends Activity{private SharedPreferences pref;private SharedPreferences.Editor editor;private EditText accountEdit;private EditText passwordEdit;private Button login;private CheckBox rememberPass;@Overrideprotected void onCreate(Bundle savedInstanceState){// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.longin);pref = PreferenceManager.getDefaultSharedPreferences(this);accountEdit = (EditText) findViewById(R.id.account);passwordEdit = (EditText) findViewById(R.id.password);login = (Button) findViewById(R.id.login);rememberPass = (CheckBox) findViewById(R.id.remember_pass);boolean isRemember = pref.getBoolean("remember_password", false);if(isRemember){//String account = pref.getString("account", "");String password = pref.getString("password", "");accountEdit.setText(account);passwordEdit.setText(password);rememberPass.setChecked(true);}login.setOnClickListener(new OnClickListener(){@Overridepublic void onClick(View arg0){String account = accountEdit.getText().toString();String password = passwordEdit.getText().toString();if(account.equals("admin") && password.equals("123456")){editor = pref.edit();if(rememberPass.isChecked()){editor.putBoolean("remember_pasword", true);editor.putString("account", account);editor.putString("password", password);}else{editor.clear();}editor.commit();Intent intent = new Intent(LoginActivity.this,MainActivity.class);startActivity(intent);finish();}else{Toast.makeText(LoginActivity.this, "account or password is invalid", Toast.LENGTH_SHORT).show();}}});}}

main.xml

<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=".MainActivity" >    <Button        android:id="@+id/force_offline"        android:layout_height="wrap_content"        android:layout_width="wrap_content"        android:text="Send force offline broadcast"/></RelativeLayout>

login.xnl

<?xml version="1.0" encoding="utf-8"?><TableLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"     android:stretchColumns="1">        <TableRow >                <TextView             android:layout_height="wrap_content"            android:text="Account:"/>                <EditText             android:id="@+id/account"            android:layout_height="wrap_content"            android:hint="Input our account"/>            </TableRow>        <TableRow >                <TextView             android:layout_height="wrap_content"            android:text="Password:"/>                <EditText             android:id="@+id/password"            android:layout_height="wrap_content"            android:hint="Input our account"/>            </TableRow>        <TableRow >                <CheckBox             android:id="@+id/remember_pass"            android:layout_height="wrap_content"/>                <TextView             android:layout_height="wrap_content"            android:text="Remember password"/>    </TableRow>        <TableRow >                <Button             android:id="@+id/login"            android:layout_height="wrap_content"            android:layout_span="2"            android:text="Login"/>    </TableRow>        </TableLayout>

activityCollector.java

package com.example.password;import java.util.ArrayList;import java.util.List;import android.app.Activity;public class ActivityCollector {public static List<Activity> activities = new ArrayList<Activity>();public static void addActivity(Activity activity){activities.add(activity);}public static void removeActivity(Activity activity){activities.remove(activity);}public static void finishAll(){for(Activity activity:activities){if(!activity.isFinishing()){activity.finish();}}}}

BaseActivity.java

package com.example.password;import android.app.Activity;import android.os.Bundle;public class BaseAcitivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);ActivityCollector.addActivity(this);}public void onDestory(){super.onDestroy();ActivityCollector.removeActivity(this);}}

ForceOfflineReceiver.java

package com.example.password;import android.app.AlertDialog;import android.content.BroadcastReceiver;import android.content.Context;import android.content.DialogInterface;import android.content.Intent;import android.view.WindowManager;public class ForceOfflineReceiver extends BroadcastReceiver{@Overridepublic void onReceive(final Context context, Intent intent) {// TODO Auto-generated method stubAlertDialog.Builder dialogBuilder = new AlertDialog.Builder(context);dialogBuilder.setTitle("Warning");dialogBuilder.setMessage("You are forced to be offline,Please try to login again");dialogBuilder.setCancelable(false);dialogBuilder.setPositiveButton("OK", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stubActivityCollector.finishAll();Intent intent = new Intent(context,LoginActivity.class);intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);context.startActivity(intent);}});AlertDialog alertdialog = dialogBuilder.create();alertdialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);alertdialog.show();}}

AndroidManifest.java

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.password"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="18" />    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name="com.example.password.MainActivity"            android:label="@string/app_name" >        </activity>        <activity            android:name="com.example.password.LoginActivity"            android:label="登录界面">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>                <receiver android:name="com.example.password.ForceOfflineReceiver">            <intent-filter>                <action android:name="com.example.broadcastbestpractice.FORCE_OFFLINE"/>            </intent-filter>        </receiver>                        </application></manifest>

 

出现的问题：