请仔细阅读...... 这是我的启动画面和后退按钮的代码。所有工作正常，除非我从应用程序退出第一次，之后没有出现启动画面但是在第一次之后，每次我点击时都会显示启动画面在应用程序图标。为什么第一次退出后没有出现闪屏？如果有任何关于问题的困惑请问我..
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
public class SplashScreen extends Activity {
// Splash screen timer
private static int SPLASH_TIME_OUT = 3000;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.splash);
new Handler().postDelayed(new Runnable() {
/*
* Showing splash screen with a timer. This will be useful when you
* want to show case your app logo / company
*/
@Override
public void run() {
// This method will be executed once the timer is over
// Start your app main activity
Intent i = new Intent(SplashScreen.this, Login.class);
startActivity(i);
// close this activity
finish();
}
}, SPLASH_TIME_OUT);
}
//handle back button press
@Override
public void onBackPressed()
{
// mIsBackButtonPressed = true;
super.onBackPressed();
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
finish();
}
}
// for back button
@Override
public void onBackPressed() {
// mIsBackButtonPressed = true;
// super.onBackPressed();
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
alertDialogBuilder.setTitle("Exit Application?");
alertDialogBuilder
.setMessage("Click yes to exit!")
.setCancelable(false)
.setPositiveButton("Yes",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// Write your code here to execute after dialog
Intent startMain = new Intent(Intent.ACTION_MAIN);
startMain.addCategory(Intent.CATEGORY_HOME);
startMain.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startMain.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startMain.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
startActivity(startMain);
finish();
UploadActivity.isQuit = true;
Toast.makeText(getApplicationContext(), "ThanK U...",
Toast.LENGTH_SHORT).show();
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog alertDialog = alertDialogBuilder.create();
alertDialog.show();
}
public static boolean isQuit = false
清单文件
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.mypackage_name">
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_INTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="com.android.launcher.permission.INSTALL_SHORTCUT" />
<uses-permission android:name="android.permission.READ_INTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_INTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_nirvan"
android:label="@string/app_name"
android:theme="@style/AppTheme"
android:clearTaskOnLaunch="true"
android:allowClearUserData="true"
>
<!--
We will launch BaseActivity as launcher.
We will check if BaseActivity launch first time and open desired activity and set navigation item selected
-->
<activity
android:name=".SplashScreen"
android:label="@string/app_name"
android:theme="@android:style/Theme.NoTitleBar.Fullscreen">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".Login"
android:label="@string/app_name"
android:screenOrientation="portrait">
</activity>
<activity android:name=".UploadActivity" />
<activity android:name=".SearchPeople" />
<activity android:name=".InviteFriends" />
<activity android:name=".ContactUs" />
<activity
android:name=".Details"
android:label="@string/title_activity_details" />
</application>
</manifest>
登录活动
package com.mypkg;
import android.app.AlertDialog;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.provider.Settings;
import android.text.Editable;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.view.animation.Animation;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;
import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.JsonHttpResponseHandler;
import com.loopj.android.http.RequestParams;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
//import com.enventpc_03.nav11.com.R;
//import com.enventpc_03.nav11.SecondTab;
public class Login extends BaseActivity {
JSONObject jsonobject;
JSONArray jsonarray;
ArrayList<String> arealist;
//ArrayList<GetterSetter> area;
// Animation
Animation animTogether;
ImageView imageView1;
// flag for Internet connection status
Boolean isInternetPresent = false;
// Connection detector class
ConnectionDetector cd;
//private Spinner spin1;
EditText editText_name, editText_MobNo, editText_email;
LoginDataBaseAdapter loginDataBaseAdapter;
public static final String PREFS_NAME = "MyPrefsFile";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
//handle the local database
loginDataBaseAdapter = new LoginDataBaseAdapter(this);
loginDataBaseAdapter = loginDataBaseAdapter.open();
// //////////////initializing variables for shortcut on home during
// installation//
Context mContext = Login.this;
SharedPreferences appPreferences;
boolean isAppInstalled = false;
// ----Shared pref. for shortcut on home during installation
// starts------//
appPreferences = PreferenceManager.getDefaultSharedPreferences(this);
isAppInstalled = appPreferences.getBoolean("isAppInstalled", false);
SharedPreferences.Editor editor = appPreferences.edit();
editor.putBoolean("isAppInstalled", true);
editor.commit();
cd = new ConnectionDetector(getApplicationContext());
// get Internet status
isInternetPresent = cd.isConnectingToInternet();
Button login = (Button) findViewById(R.id.button_register);
login.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
cd = new ConnectionDetector(getApplicationContext());
// get Internet status
isInternetPresent = cd.isConnectingToInternet();
EditText user = (EditText) findViewById(R.id.editText_enter_name);
EditText mobile = (EditText) findViewById(R.id.editText_mobNo);
EditText email = (EditText) findViewById(R.id.editText_email);
//loginDataBaseAdapter.insertEntry(user, mobile, email);
// Check The Validity of empty fields
boolean Resp = validate(new EditText[]{user});
// Check The Validity of emailID
// boolean e_valid = isEmailValid(email.getText());
// Check The Validity of Mobile Numbers
boolean mobile_valid = isMobValid(mobile.getText());
if (Resp && mobile_valid) {
PostJson();
} else {
// Toast.makeText(Login.this, "Field incorrect..!!!",
// Toast.LENGTH_SHORT).show();
}
if (Resp) {
String pass = mobile.getText().toString();
if (TextUtils.isEmpty(pass) || pass.length() < 10) {
Toast.makeText(Login.this,
"Mobile number should be of 10 digits..",
Toast.LENGTH_SHORT).show();
return;
}// Chk Validation of mobile number
if (mobile_valid) {
if (isInternetPresent) {
Toast.makeText(Login.this, "Connecting....", Toast.LENGTH_LONG)
.show();
} else {
Toast.makeText(Login.this, "Unable to connect the server, please check your data settings", Toast.LENGTH_LONG)
.show();
}
}
}
}
public boolean isMobValid(Editable mobile) {
boolean isOk = false;
String exp = "^[0-9]{10}$";
CharSequence inputStr = mobile;
Pattern pattern = Pattern
.compile(exp, Pattern.CASE_INSENSITIVE);
Matcher matcher = pattern.matcher(inputStr);
if (matcher.matches()) {
isOk = true;
}
return isOk;
}
public boolean validate(EditText[] fields) {
// TODO Auto-generated method stub
for (int i = 0; i < fields.length; i++) {
EditText currentField = fields[i];
if (currentField.getText().toString().length() <= 0) {
Toast.makeText(Login.this, "Enter all the fields..!!!",
Toast.LENGTH_SHORT).show();
return false;
}
}
return true;
}
});
}
// ==========//
// Function to display simple Alert Dialog- success/failure (used to set
// icon)
public void showAlertDialog(Context context, String title, String message,
Boolean status) {
AlertDialog alertDialog = new AlertDialog.Builder(context).create();
// Setting Dialog Title
alertDialog.setTitle(title);
// Setting Dialog Message
alertDialog.setMessage(message);
// Setting alert dialog icon
alertDialog.setIcon((status) ? R.drawable.success : R.drawable.fail);
// Showing Alert Message
alertDialog.show();
}
// ==================================================================================================================//
// == To Pupolate the City/Zone Spinner ==//
// ================= Populatin City/Zone Spinner Ends=======//
// =========================== Json Object==================//
public void PostJson() {
AsyncHttpClient client = new AsyncHttpClient();
final RequestParams params = new RequestParams();
EditText user = (EditText) findViewById(R.id.editText_enter_name);
EditText mobile = (EditText) findViewById(R.id.editText_mobNo);
EditText email = (EditText) findViewById(R.id.editText_email);
//spin1 = (Spinner) findViewById(R.id.spinner1);
//Local database
editText_name = (EditText) findViewById(R.id.editText_enter_name);
editText_MobNo = (EditText) findViewById(R.id.editText_mobNo);
editText_email = (EditText) findViewById(R.id.editText_email);
//////////////////////////////////////////////////////////////////////////////////
final String source = "Android";
final String user_name = user.getText().toString();
final String mobile_no = mobile.getText().toString();
final String email_id = email.getText().toString();
String indate = Settings.Secure.getString(this.getContentResolver(),
Settings.Secure.ANDROID_ID);
Toast.makeText(this, indate, Toast.LENGTH_SHORT).show();
//final String area = spin1.getSelectedItem().toString();
params.put("source", source); // /parameters need to post.
params.put("user", user_name); // /parameters need to post.
params.put("email_id", email_id); // /parameters need to post.
params.put("mobile", mobile_no); // /parameters need to post.
params.put("indate", indate);
// params.put("area", area); // /parameters need to post.
//
// SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(Login.this);
String Url = "myurl/user_login/index.php";
client.get(Url, params, new JsonHttpResponseHandler() {
@Override
public void onStart() {
System.out.println("Starting request");
}
@Override
public void onSuccess(JSONObject response) {
try {
String mesaage = response.getString("message");
String success = response.getString("success");
String user_id = response.getString("user_id");
if (success.equalsIgnoreCase("0")) {
Toast.makeText(Login.this, mesaage, Toast.LENGTH_LONG)
.show();
} else {
Toast.makeText(Login.this, mesaage, Toast.LENGTH_LONG)
.show();
// if email and mb is valid than login
Intent i1 = new Intent(Login.this, UploadActivity.class);
startActivity(i1);
finish();
//local database
String userName = editText_name.getText().toString();
String mob = editText_MobNo.getText().toString();
String email = editText_email.getText().toString();
loginDataBaseAdapter.insertEntry(userName, mob, email);
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
SharedPreferences.Editor editor = preferences.edit();
// save in cache memory
editor.putString("MOB", mobile_no);
editor.commit();
/*
* Intent i1 = new Intent(Login.this, Splash.class);
* startActivity(i1); finish();
*/
// //////// { onFinish body}///////////////////////////////
Log.e("FINISHED_LOG", "onFinish request");
SharedPreferences settings = getSharedPreferences(
Login.PREFS_NAME, MODE_MULTI_PROCESS);
SharedPreferences.Editor editor1 = settings.edit();
// Set "hasLoggedIn" to true
editor1.putBoolean("hasLoggedIn", true);
// Commit the edits!
editor1.commit();
// ////////////////////////////////////////////////////////
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public void onFailure(Throwable e, String response) {
Log.e("ERROR_LOG", "onFailure request" + e.toString());
Toast.makeText(Login.this, "Error in Connection.....",
Toast.LENGTH_SHORT).show();
}
@Override
public void onFinish() {
// //////// { onFinish body}///////////////////////////////
super.onFinish();
// ////////////////////////////////////////////////////////
}
});
}
// ==========================Re-Start/Ending of
// project=============================================//
@Override
protected void onRestart() {
// TODO Auto-generated method stub
super.onRestart();
finish();
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
SharedPreferences settings = getSharedPreferences(Login.PREFS_NAME, 0);
boolean hasLoggedIn = settings.getBoolean("hasLoggedIn", false);
if (hasLoggedIn) {
// Go directly to main activity
Intent i1 = new Intent(Login.this, SplashScreen.class);
startActivity(i1);
finish();
}
}
// ==========================Re-Start/Ending of
// project=============================================//
@Override
protected void onStart() {
// TODO Auto-generated method stub
super.onStart();
SharedPreferences settings = getSharedPreferences(Login.PREFS_NAME, 0);
// Get "hasLoggedIn" value. If the value doesn't exist yet false is
// returned
boolean hasLoggedIn = settings.getBoolean("hasLoggedIn", false);
if (hasLoggedIn) {
// Go directly to main activity
Intent i1 = new Intent(Login.this, UploadActivity.class);
startActivity(i1);
finish();
}
}
}
答案 0 :(得分：0)
这应该是你的启动画面
public class SplashScreen extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.splash_layout);
Thread thread=new Thread(){
@Override
public void run() {
super.run();
try {
sleep(3*1000);
Intent intent=new Intent(SplashScreen.this,MainActivity.class);
startActivity(intent);
finish();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
};
thread.start();
}}
// Android Manifest // Intent Fileter（MAIN和LAUNCH都在.Splash内）
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<meta-data
android:name="com.google.android.geo.API_KEY"
android:value="###############33"/>
</activity>
<activity android:name=".SplashScreen"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>