我正在尝试在不满足登录验证时禁用按钮。任何人都可以帮助我如何做到这一点。我的代码和我使用的是android studio1.2.2。谢谢。
package com.example.poornima.bookmyticket;
import com.example.poornima.bookmyticket.util.SystemUiHider;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import android.view.Menu;
import android.widget.TextView;
import android.widget.Toast;
/**
* An example full-screen activity that shows and hides the system UI (i.e.
* status bar and navigation/system bar) with user interaction.
*
* @see SystemUiHider
*/
public class login extends Activity implements View.OnClickListener {
private Button bLogin, bRegister;
private EditText eusername, epassword;
/**
* Whether or not the system UI should be auto-hidden after
* {@link #AUTO_HIDE_DELAY_MILLIS} milliseconds.
*/
private static final boolean AUTO_HIDE = true;
/**
* If {@link #AUTO_HIDE} is set, the number of milliseconds to wait after
* user interaction before hiding the system UI.
*/
private static final int AUTO_HIDE_DELAY_MILLIS = 3000;
/**
* If set, will toggle the system UI visibility upon interaction. Otherwise,
* will show the system UI visibility upon interaction.
*/
private static final boolean TOGGLE_ON_CLICK = true;
/**
* The flags to pass to {@link SystemUiHider#getInstance}.
*/
private static final int HIDER_FLAGS = SystemUiHider.FLAG_HIDE_NAVIGATION;
/**
* The instance of the {@link SystemUiHider} for this activity.
*/
private SystemUiHider mSystemUiHider;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
final View controlsView = findViewById(R.id.fullscreen_content_controls);
final View contentView = findViewById(R.id.fullscreen_content);
bLogin = (Button) findViewById(R.id.bLogin);
bRegister = (Button) findViewById(R.id.bRegister);
eusername = (EditText) findViewById(R.id.eusername);
epassword = (EditText) findViewById(R.id.epassword);
bLogin.setOnClickListener(this);
bRegister.setOnClickListener(this);
// Set up an instance of SystemUiHider to control the system UI for
// this activity.
mSystemUiHider = SystemUiHider.getInstance(this, contentView, HIDER_FLAGS);
mSystemUiHider.setup();
mSystemUiHider
.setOnVisibilityChangeListener(new SystemUiHider.OnVisibilityChangeListener() {
// Cached values.
int mControlsHeight;
int mShortAnimTime;
@Override
@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
public void onVisibilityChange(boolean visible) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
// If the ViewPropertyAnimator API is available
// (Honeycomb MR2 and later), use it to animate the
// in-layout UI controls at the bottom of the
// screen.
if (mControlsHeight == 0) {
mControlsHeight = controlsView.getHeight();
}
if (mShortAnimTime == 0) {
mShortAnimTime = getResources().getInteger(
android.R.integer.config_shortAnimTime);
}
controlsView.animate()
.translationY(visible ? 0 : mControlsHeight)
.setDuration(mShortAnimTime);
} else {
// If the ViewPropertyAnimator APIs aren't
// available, simply show or hide the in-layout UI
// controls.
controlsView.setVisibility(visible ? View.VISIBLE : View.GONE);
}
if (visible && AUTO_HIDE) {
// Schedule a hide().
delayedHide(AUTO_HIDE_DELAY_MILLIS);
}
}
});
// Set up the user interaction to manually show or hide the system UI.
contentView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (TOGGLE_ON_CLICK) {
mSystemUiHider.toggle();
} else {
mSystemUiHider.show();
}
}
});
// Upon interacting with UI controls, delay any scheduled hide()
// operations to prevent the jarring behavior of controls going away
// while interacting with the UI.
}
@Override
public void onClick(View v) {
final String username = eusername.getText().toString();
if (!isValidUsername(username)) {
eusername.setError("Username Minimum OF 4 Letters");
}
final String password = epassword.getText().toString();
if (!isValidPassword(password)) {
epassword.setError("Password Minimum OF 6 Letters");
}
switch(v.getId()) {
case R.id.bRegister:
startActivity(new Intent(this, register.class));
break;
case R.id.bLogin:
startActivity(new Intent(this, myactivity.class));
break;
}
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Trigger the initial hide() shortly after the activity has been
// created, to briefly hint to the user that UI controls
// are available.
delayedHide(100);
}
/**
* Touch listener to use for in-layout UI controls to delay hiding the
* system UI. This is to prevent the jarring behavior of controls going away
* while interacting with activity UI.
*/
View.OnTouchListener mDelayHideTouchListener = new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
if (AUTO_HIDE) {
delayedHide(AUTO_HIDE_DELAY_MILLIS);
}
return false;
}
};
Handler mHideHandler = new Handler();
Runnable mHideRunnable = new Runnable() {
@Override
public void run() {
mSystemUiHider.hide();
}
};
/**
* Schedules a call to hide() in [delay] milliseconds, canceling any
* previously scheduled calls.
*/
private void delayedHide(int delayMillis) {
mHideHandler.removeCallbacks(mHideRunnable);
mHideHandler.postDelayed(mHideRunnable, delayMillis);
}
private boolean isValidUsername(String username) {
if (username != null && username.length() > 4) {
return true;
}
return false;
}
private boolean isValidPassword(String password) {
if (password != null && password.length() > 6) {
return true;
}
return false;
}
}
##login.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:background="@drawable/train1"
tools:context="gss.bookmyticket.LOGIN">
<LinearLayout
android:id="@+id/fullscreen_content_controls"
style="?metaButtonBarStyle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom|center_horizontal"
android:orientation="horizontal"
tools:ignore="UselessParent" >
</LinearLayout>
<TextView
android:id="@+id/fullscreen_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:keepScreenOn="true"
android:text=" "
android:textStyle="bold"
android:layout_below="@+id/fullscreen_content_controls"
android:layout_alignParentStart="true" />
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/imageButton"
android:src="@drawable/image1"
android:background="@android:color/transparent"
android:layout_below="@+id/fullscreen_content_controls"
android:layout_centerHorizontal="true" />
<EditText
android:layout_width="300dp"
android:layout_height="50dp"
android:id="@+id/eusername"
android:background="@drawable/s1"
android:textColor="#78909C"
android:hint="USERNAME"
android:gravity="center"
android:layout_marginTop="46dp"
android:layout_below="@+id/imageButton"
android:layout_centerHorizontal="true" />
<EditText
android:layout_width="300dp"
android:layout_height="50dp"
android:inputType="textPassword"
android:gravity="center"
android:background="@drawable/s1"
android:ems="10"
android:id="@+id/epassword"
android:hint="PASSWORD"
android:textColor="#78909C"
android:layout_marginTop="60dp"
android:layout_below="@+id/eusername"
android:layout_alignEnd="@+id/eusername"
android:layout_alignStart="@+id/eusername" />
<Button
android:layout_width="120dp"
android:background="@drawable/s2"
android:layout_height="wrap_content"
android:text="SIGN IN"
android:id="@+id/bLogin"
android:layout_alignTop="@+id/bRegister"
android:layout_alignStart="@+id/epassword" />
<Button
android:layout_width="120dp"
android:layout_height="wrap_content"
android:text="SIGN UP"
android:background="@drawable/s4"
android:id="@+id/bRegister"
android:layout_alignParentBottom="true"
android:layout_alignEnd="@+id/epassword"
android:layout_marginBottom="56dp" />
<ImageView
android:layout_width="25dp"
android:layout_height="25dp"
android:id="@+id/imageView"
android:src="@drawable/user"
android:layout_marginLeft="10dp"
android:paddingLeft="0dp"
android:paddingRight="0dp"
android:paddingTop="0dp"
android:paddingBottom="0dp"
android:layout_alignTop="@+id/eusername"
android:layout_alignStart="@+id/eusername"
android:layout_alignBottom="@+id/eusername" />
<ImageView
android:layout_width="25dp"
android:layout_height="25dp"
android:src="@drawable/i3"
android:layout_marginLeft="0dp"
android:id="@+id/imageView2"
android:layout_alignTop="@+id/epassword"
android:layout_alignBottom="@+id/epassword"
android:layout_alignStart="@+id/imageView" />
</RelativeLayout>
答案 0 :(得分：2)
public ArrayList<String> GetAllPerson() {
ArrayList<UserBean> list = new ArrayList<UserBean>();
ArrayList<String> l = new ArrayList<String>();
list.clear();
SQLiteDatabase database = this.getWritableDatabase();
Cursor cursor = database.rawQuery("select * from AddNewPerson", null);
UserBean bean;
if (cursor.moveToFirst()) {
bean = new UserBean();
while (cursor.isAfterLast() == false) {
bean = new UserBean();
bean.NU_id = cursor.getString(cursor.getColumnIndex("NU_id"));
bean.Name = cursor.getString(cursor.getColumnIndex("Name"));
bean.Amount = cursor.getString(cursor.getColumnIndex("Amount"));
bean.Description = cursor.getString(cursor
.getColumnIndex("Description"));
bean.DateandTime = cursor.getString(cursor
.getColumnIndex("DateandTime"));
l.add(bean.Name);
list.add(bean);
cursor.moveToNext();
}
}
return list;
}