我正在构建一个小型 android 应用程序来连接数据库并检查用户名和密码是否匹配，然后它应该给我消息，否则 || . 我的数据库托管在我的虚拟机 Ubuntu 上。
<?php
$con= mysql_connect("localhost","root","123456") or die ("can't connect");
mysql_select_db("androiddb",$con) or die("can't select the database");
$username = $_POST['username'];
$password = $_POST['password'];
$query = mysql_query("SELECT * FROM androidlogin WHERE user=$username' AND pass=$password");
$num = mysql_num_rows($query);
if($num == 1){
while($list = mysql_fetch_assoc($num)){
$output[] = $list;
echo json_decode($output);
}
}
mysql_close();
我的java文件。包 com.example.logintutorial；
/// solved the problem from this link
//http://stackoverflow.com/questions/3538647/android-development-button-onclicklisteners-help
//import android.view.View.OnClickListener;
public class MainActivity extends Activity implements OnClickListener, android.view.View.OnClickListener {
EditText etUser,etPass;
Button bLogin;
String username, password;
// use http clinet as form of container
HttpClient httpClient;
HttpPost httpposts;
//create an arry list of data to be sent
ArrayList<NameValuePair> nameValuePairs;
// http response http entity
HttpResponse response;
HttpEntity entity;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initialise();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
public void initialise(){
etUser = (EditText) findViewById(R.id.etUser);
etPass = (EditText) findViewById(R.id.etPass);
bLogin = (Button) findViewById(R.id.etSubmit);
bLogin.setOnClickListener(this);
}
@Override
public void onClick(View v) {
//defualt http clinet
DefaultHttpClient httpclient = new DefaultHttpClient();
final String KEY_121= "http://192.168.1.139:8080/android_login/newfile.php";
//create new HTTp post with Url to php file as master
HttpPost httppost = new HttpPost(KEY_121);
//ssign inpyt to the strings
username= etUser.getText().toString();
password= etPass.getText().toString();
try{
//create a new array list
nameValuePairs = new ArrayList<NameValuePair>();
//place them in array list
nameValuePairs.add(new BasicNameValuePair("username",username));
nameValuePairs.add(new BasicNameValuePair("password",password));
// add the array to the post
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
//assign excuted form container to response
response = httpclient.execute(httppost);
//check ing the status code
if(response.getStatusLine().getStatusCode()==200){
// assign respone to http entity
entity = response.getEntity();
//if enitty is not null
if(entity!=null){
// create an entity with reviecd data assing
InputStream instream = entity.getContent();
//Create new Json Object. assing converted data as a paramter
JSONObject jsonResponse = new JSONObject(convertStreamToString(instream));
String retUser= jsonResponse.getString("user");//mysql field
String retPass= jsonResponse.getString("pass");
if(username.equals(retUser) && password.equals(retPass)){
//create a new shared perefere by getting the preference
SharedPreferences sp = getSharedPreferences("Logindetails",0);
SharedPreferences.Editor spedit = sp.edit();
spedit.putString("user", username);
spedit.putString("pass", password);
spedit.commit();
//login success message
Toast.makeText(getBaseContext(),"You are logged in", Toast.LENGTH_SHORT).show();
} else{
//display
Toast.makeText(getBaseContext(),"Invalid Login", Toast.LENGTH_SHORT).show();
}
}
}
}catch (Exception e){
e.printStackTrace();
Toast.makeText(getBaseContext(),"Connection Error", Toast.LENGTH_SHORT).show();
}
}
@Override
public void onClick(DialogInterface dialog, int which) {
}
private static String convertStreamToString(InputStream is) {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
}
我的清单
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="16" />
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.logintutorial.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
我的错误。单击登录时。我在 catch 部分收到“连接错误”。这在我的聊天记录中
03-21 10:03:45.479: W/IInputConnectionWrapper(635): showStatusIcon on inactive InputConnection
03-21 10:03:57.849: D/InputEventConsistencyVerifier(635): KeyEvent: ACTION_UP but key was not down.
03-21 10:03:57.849: D/InputEventConsistencyVerifier(635): in android.widget.EditText@41213f98
03-21 10:03:57.849: D/InputEventConsistencyVerifier(635): 0: sent at 182837000000, KeyEvent { action=ACTION_UP, keyCode=KEYCODE_TAB, scanCode=15, metaState=0, flags=0x8, repeatCount=0, eventTime=182837, downTime=182714, deviceId=0, source=0x101 }
03-21 10:04:00.579: W/System.err(635): android.os.NetworkOnMainThreadException
03-21 10:04:00.589: W/System.err(635): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
03-21 10:04:00.589: W/System.err(635): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
03-21 10:04:00.589: W/System.err(635): at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
03-21 10:04:00.589: W/System.err(635): at libcore.io.IoBridge.connect(IoBridge.java:112)
03-21 10:04:00.589: W/System.err(635): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
03-21 10:04:00.589: W/System.err(635): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
03-21 10:04:00.599: W/System.err(635): at java.net.Socket.connect(Socket.java:842)
03-21 10:04:00.599: W/System.err(635): at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
03-21 10:04:00.599: W/System.err(635): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144)
03-21 10:04:00.599: W/System.err(635): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
03-21 10:04:00.599: W/System.err(635): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
03-21 10:04:00.609: W/System.err(635): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
03-21 10:04:00.609: W/System.err(635): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
03-21 10:04:00.609: W/System.err(635): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
03-21 10:04:00.609: W/System.err(635): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
03-21 10:04:00.609: W/System.err(635): at com.example.logintutorial.MainActivity.onClick(MainActivity.java:114)
03-21 10:04:00.609: W/System.err(635): at android.view.View.performClick(View.java:4084)
03-21 10:04:00.620: W/System.err(635): at android.view.View$PerformClick.run(View.java:16966)
03-21 10:04:00.620: W/System.err(635): at android.os.Handler.handleCallback(Handler.java:615)
03-21 10:04:00.620: W/System.err(635): at android.os.Handler.dispatchMessage(Handler.java:92)
03-21 10:04:00.629: W/System.err(635): at android.os.Looper.loop(Looper.java:137)
03-21 10:04:00.629: W/System.err(635): at android.app.ActivityThread.main(ActivityThread.java:4745)
03-21 10:04:00.629: W/System.err(635): at java.lang.reflect.Method.invokeNative(Native Method)
03-21 10:04:00.629: W/System.err(635): at java.lang.reflect.Method.invoke(Method.java:511)
03-21 10:04:00.629: W/System.err(635): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
03-21 10:04:00.639: W/System.err(635): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
03-21 10:04:00.639: W/System.err(635): at dalvik.system.NativeStart.main(Native Method)
03-21 10:04:05.069: W/System.err(635): android.os.NetworkOnMainThreadException
03-21 10:04:05.069: W/System.err(635): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
03-21 10:04:05.069: W/System.err(635): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
03-21 10:04:05.079: W/System.err(635): at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
03-21 10:04:05.079: W/System.err(635): at libcore.io.IoBridge.connect(IoBridge.java:112)
03-21 10:04:05.079: W/System.err(635): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
03-21 10:04:05.079: W/System.err(635): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
03-21 10:04:05.089: W/System.err(635): at java.net.Socket.connect(Socket.java:842)
03-21 10:04:05.089: W/System.err(635): at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
03-21 10:04:05.099: W/System.err(635): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144)
03-21 10:04:05.099: W/System.err(635): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
03-21 10:04:05.099: W/System.err(635): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
03-21 10:04:05.099: W/System.err(635): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
03-21 10:04:05.099: W/System.err(635): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
03-21 10:04:05.099: W/System.err(635): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
03-21 10:04:05.109: W/System.err(635): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
03-21 10:04:05.109: W/System.err(635): at com.example.logintutorial.MainActivity.onClick(MainActivity.java:114)
03-21 10:04:05.109: W/System.err(635): at android.view.View.performClick(View.java:4084)
03-21 10:04:05.119: W/System.err(635): at android.view.View$PerformClick.run(View.java:16966)
03-21 10:04:05.119: W/System.err(635): at android.os.Handler.handleCallback(Handler.java:615)
03-21 10:04:05.119: W/System.err(635): at android.os.Handler.dispatchMessage(Handler.java:92)
03-21 10:04:05.119: W/System.err(635): at android.os.Looper.loop(Looper.java:137)
03-21 10:04:05.129: W/System.err(635): at android.app.ActivityThread.main(ActivityThread.java:4745)
03-21 10:04:05.129: W/System.err(635): at java.lang.reflect.Method.invokeNative(Native Method)
03-21 10:04:05.129: W/System.err(635): at java.lang.reflect.Method.invoke(Method.java:511)
03-21 10:04:05.129: W/System.err(635): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
03-21 10:04:05.129: W/System.err(635): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
03-21 10:04:05.129: W/System.err(635): at dalvik.system.NativeStart.main(Native Method)