Android入门之login设计
效果图：
MainActivity.java
package jk.quickpay.login;
import jk.quickpay.login.FileService;
import java.util.Map;
import android.app.Activity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends Activity {
public EditText edit_name, edit_pass;
public Button btn_login;
public CheckBox box_remeber;
public FileService fileService;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fileService = new FileService(this);
edit_name = (EditText) findViewById(R.id.edit_name);
edit_pass = (EditText) findViewById(R.id.edit_pass);
btn_login = (Button) findViewById(R.id.btn_login);
box_remeber = (CheckBox) findViewById(R.id.cbx_remember);
btn_login.setOnClickListener(new MyOnClickListener());
Map<String, String> map = fileService.readFile("private.txt");
if (map != null) {
edit_name.setText(map.get("name"));
edit_pass.setText(map.get("pass"));
}
}
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
class MyOnClickListener implements View.OnClickListener {
public void onClick(View v) {
int id = v.getId();
switch (id) {
case R.id.btn_login:
String name = edit_name.getText().toString();
String pass = edit_pass.getText().toString();
if (TextUtils.isEmpty(name)) {
Toast.makeText(MainActivity.this, "用户名不能为空",
Toast.LENGTH_SHORT).show();
return;
} else if (TextUtils.isEmpty(pass)) {
Toast.makeText(MainActivity.this, "密码不能为空",
Toast.LENGTH_SHORT).show();
return;
} else {
if (box_remeber.isChecked()) {
MainActivity.this.fileService.saveToRom(name, pass,
"private.txt");
Toast.makeText(MainActivity.this, "用户名和密码已保存",
Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(MainActivity.this, "用户名和密码不需要保存",
Toast.LENGTH_SHORT).show();
}
}
break;
default:
break;
}
}
}
}
FileService.java
package jk.quickpay.login;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.HashMap;
import java.util.Map;
import jk.quickpay.login.StreamTools;
import android.content.Context;
public class FileService {
public Context context;
public FileService(Context context) {
this.context = context;
}
public boolean saveToRom(String name,String pass,String fileName){
try{
FileOutputStream fos=context.openFileOutput(fileName, Context.MODE_PRIVATE);
String result=name+":"+pass;
fos.write(result.getBytes());
fos.flush();
fos.close();
}catch(Exception e){
e.printStackTrace();
return false;
}
return true;
}
public Map<String,String> readFile(String fileName){
Map<String,String> map=null;
try{
FileInputStream fis=context.openFileInput(fileName);
String value=StreamTools.getValue(fis);
String values[]=value.split(":");
if(values.length>0){
map=new HashMap<String, String>();
map.put("name", values[0]);
map.put("pass", values[1]);
}
}catch(Exception e){
e.printStackTrace();
}
return map;
}
}
StreamTools.java
package jk.quickpay.login;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
public class StreamTools {
public static String getValue(FileInputStream fis) throws Exception{
ByteArrayOutputStream stream=new ByteArrayOutputStream();
byte[] buffer=new byte[1024];
int length=-1;
while((length=fis.read(buffer))!=-1){
stream.write(buffer,0,length);
}
stream.flush();
stream.close();
String value=stream.toString();
return value;
}
}
activity_main.xml
<LinearLayout 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=".LoginActivity" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/view_account"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/account" />
<EditText
android:id="@+id/edit_name"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:ems="10"
android:inputType="textPersonName" >
<requestFocus />
</EditText>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/view_pass"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/password" />
<EditText
android:id="@+id/edit_pass"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:ems="10"
android:inputType="textPassword" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="@+id/btn_login"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="0.1"
android:text="@string/login" />
<Button
android:id="@+id/btn_reg"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="0.1"
android:text="@string/register" />
<Button
android:id="@+id/btn_out"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="0.1"
android:text="@string/quit" />
</LinearLayout>
<CheckBox
android:id="@+id/cbx_remember"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="80dp"
android:text="@string/text_rember" />
</LinearLayout>
</LinearLayout>