好吧,我正在尝试创建一个与我已经设置,测试过的套接字通信的应用程序,并在一个简单的Java应用程序的后台工作.
问题是,我的应用程序立即强制关闭.在fcs之前你没有机会看到任何东西.
这是我的代码:
import java.io.IOException;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Scanner;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
import android.widget.Toast;
public class LogMeInClientActivity extends Activity {
private Socket s;
private InetAddress hostIp, localIp;
private final String hostName = "localhost";
private final int port = 4000;
private Scanner in;
private PrintWriter out;
private final EditText usernameField = (EditText) findViewById(R.id.username_field),
passwordField = (EditText) findViewById(R.id.password_field);
private String username, password;
@Override
public void onCreate(Bundle savedInstanceState) …我想强制关闭我的应用程序作为Android系统.
如选择下面的系统步骤.
"Setting" -> "Apps" -> "my app name" -> "Force stop"
我想通过代码实现相同的行为.
我该怎么做？
Android Activityname.this()和thisAndroid 之间有什么区别吗？
我试图用对话框中的按钮打开同一活动的活动？我是getApplicationContext()故意使用的.在某些手机中,它可以正常工作,但在其他手机中却强行关闭？
之间ActivityName.this和这其中的一个,我应该使用和为什么？
这是我的警报对话框代码：我添加了 Navigator.pop(context); 在点击的方法调用中。但它并没有关闭。
showLoginDialog(BuildContext context,
{TextEditingController usernameController,
TextEditingController loginController}) {
var textController = new TextEditingController();
var nameTextController = new TextEditingController();
String dateToPost;
Alert(
context: context,
title: "Add Profile",
content: Column(
children: <Widget>[
TextField(
controller: nameTextController,
decoration: InputDecoration(
labelText: 'Name',
),
),
TextField(
controller: textController,
onTap: () async {
DateTime date = DateTime(1900);
//FocusScope.of(context).requestFocus(new FocusNode());
date = await showDatePicker(
context: context,
initialDate: DateTime.now(),
firstDate: DateTime(1900),
lastDate: DateTime.now());
var formatter = new DateFormat('dd MMM yyyy');
var formatterToPost = new DateFormat('yyyy-MM-dd');
String formatted …我正在尝试禁用 Android 设置中管理应用程序页面中的强制停止按钮。某些应用程序即使在其服务处于运行状态时也能够执行此操作，强制停止按钮处于禁用状态。请问有人能帮我解决这个问题吗？
这是我的第一个Android应用程序.我发布了我用于HTTP连接的代码(不是我的,这是来自一个教程站点).问题是当我按下按钮下载文本时,它会显示进度对话框并关闭应用程序强制.我发布了代码.
package com.example.httpconnectsample;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import android.app.Activity;
import android.app.ProgressDialog;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
public class Httpconnectionsample extends Activity {
private Button getImageButton;
private Button getTextButton;
private ProgressDialog progressDialog;
private Bitmap bitmap = null;
private String text = null;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) …我刚刚完成了我的第一个cocos2d-x游戏.我已经在我的GNexus 4.1和其他较低设备上测试了它,包括平板电脑.但是,当购买并下载到Nexus 7时,它甚至不会打开.它运行4.2,这可能是问题吗？任何帮助,将不胜感激.崩溃报告:
java.lang.ExceptionInInitializerError
at java.lang.Class.newInstanceImpl(Native Method)
at java.lang.Class.newInstance(Class.java:1319)
at android.app.Instrumentation.newActivity(Instrumentation.java:1054)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5039)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.UnsatisfiedLinkError: Cannot load library: soinfo_relocate(linker.cpp:975): cannot locate symbol "__exidx_end" referenced by "libgame.so"...
at java.lang.Runtime.loadLibrary(Runtime.java:371)
at java.lang.System.loadLibrary(System.java:535)
at com.penguinproductions.classiclightcycles.<clinit>(classiclightcycles.java:107)
... 15 more
我的音乐播放器应用程序似乎有问题.当我退出它时,会弹出强制关闭警告.这是代码的一部分,我认为在调试它之后可能是问题的原因:
private Runnable mUpdateTimeTask = new Runnable() {
public void run() {
long totalDuration = mp.getDuration();
long currentDuration = mp.getCurrentPosition();
// Displaying Total Duration time
songTotalDurationLabel.setText(""+utils.milliSecondsToTimer(totalDuration));
// Displaying time completed playing
songCurrentDurationLabel.setText(""+utils.milliSecondsToTimer(currentDuration));
// Updating progress bar
int progress = (int)(utils.getProgressPercentage(currentDuration, totalDuration));
//Log.d("Progress", ""+progress);
songProgressBar.setProgress(progress);
// Running this thread after 100 milliseconds
mHandler.postDelayed(this, 100);
}
};
这是logcat:
12-13 13:26:01.700: E/AndroidRuntime(31838): FATAL EXCEPTION: main
12-13 13:26:01.700: E/AndroidRuntime(31838): java.lang.IllegalStateException
12-13 13:26:01.700: E/AndroidRuntime(31838): at android.media.MediaPlayer.getDuration(Native Method)
12-13 13:26:01.700: E/AndroidRuntime(31838): at com.example.musicshare.AndroidBuildingMusicPlayerActivity$1.run(AndroidBuildingMusicPlayerActivity.java:341)
12-13 13:26:01.700: E/AndroidRuntime(31838): …我正在尝试启动一个新的Activity,android.这是创建以下错误.注意:我已更新清单中的新活动
logcat的
06-27 18:00:39.543: D/AndroidRuntime(908): Shutting down VM
06-27 18:00:39.543: W/dalvikvm(908): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
06-27 18:00:39.563: E/AndroidRuntime(908): FATAL EXCEPTION: main
06-27 18:00:39.563: E/AndroidRuntime(908): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.dipl.smpm.smpm/com.dipl.smpm.smpm.UpdateTask}: android.view.InflateException: Binary XML file line #15: Error inflating class button
06-27 18:00:39.563: E/AndroidRuntime(908): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
06-27 18:00:39.563: E/AndroidRuntime(908): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
06-27 18:00:39.563: E/AndroidRuntime(908): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
06-27 18:00:39.563: E/AndroidRuntime(908): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
06-27 18:00:39.563: E/AndroidRuntime(908): at android.os.Handler.dispatchMessage(Handler.java:99)
06-27 18:00:39.563: E/AndroidRuntime(908): at android.os.Looper.loop(Looper.java:123)
06-27 18:00:39.563: E/AndroidRuntime(908): at android.app.ActivityThread.main(ActivityThread.java:4627)
06-27 18:00:39.563: …如果我的应用程序在后台运行，并且我强行关闭它，我怎样才能让应用程序检测到它在后台被强行关闭？有没有我可以调用的特定函数来检测这个？