Android应用程序不断崩溃
Posted
技术标签:
【中文标题】Android应用程序不断崩溃【英文标题】:Android App Keeps Crashing 【发布时间】:2013-03-26 03:05:54 【问题描述】:每当我打开我的 android 应用程序时,我都会不断收到错误消息
应用程序 app_name(process com.random.stuff) 已意外停止。 请重试
Logcat
04-04 05:51:39.975: D/AndroidRuntime(480): Shutting down VM
04-04 05:51:39.975: W/dalvikvm(480): threadid=1: thread exiting with uncaught exception (group=0x40015560)
04-04 05:51:40.076: E/AndroidRuntime(480): FATAL EXCEPTION: main
04-04 05:51:40.076: E/AndroidRuntime(480): java.lang.RuntimeException: Unable to instantiate activity ComponentInfocom.thenewboston.joseph/com.random.stuff.StartingPoint: java.lang.NullPointerException
04-04 05:51:40.076: E/AndroidRuntime(480): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1569)
04-04 05:51:40.076: E/AndroidRuntime(480): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
04-04 05:51:40.076: E/AndroidRuntime(480): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
04-04 05:51:40.076: E/AndroidRuntime(480): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
04-04 05:51:40.076: E/AndroidRuntime(480): at android.os.Handler.dispatchMessage(Handler.java:99)
04-04 05:51:40.076: E/AndroidRuntime(480): at android.os.Looper.loop(Looper.java:123)
04-04 05:51:40.076: E/AndroidRuntime(480): at android.app.ActivityThread.main(ActivityThread.java:3683)
04-04 05:51:40.076: E/AndroidRuntime(480): at java.lang.reflect.Method.invokeNative(Native Method)
04-04 05:51:40.076: E/AndroidRuntime(480): at java.lang.reflect.Method.invoke(Method.java:507)
04-04 05:51:40.076: E/AndroidRuntime(480): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
04-04 05:51:40.076: E/AndroidRuntime(480): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
04-04 05:51:40.076: E/AndroidRuntime(480): at dalvik.system.NativeStart.main(Native Method)
04-04 05:51:40.076: E/AndroidRuntime(480): Caused by: java.lang.NullPointerException
04-04 05:51:40.076: E/AndroidRuntime(480): at com.random.stuff.StartingPoint.(StartingPoint.java:17)
04-04 05:51:40.076: E/AndroidRuntime(480): at java.lang.Class.newInstanceImpl(Native Method)
04-04 05:51:40.076: E/AndroidRuntime(480): at java.lang.Class.newInstance(Class.java:1409)
04-04 05:51:40.076: E/AndroidRuntime(480): at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
04-04 05:51:40.076: E/AndroidRuntime(480): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1561)
04-04 05:51:40.076: E/AndroidRuntime(480): ... 11 more
起点:
包 com.thenewboston.joseph; 导入android.os.Bundle; 导入android.app.Activity; 导入 android.text.Editable; 导入android.view.View; 导入android.widget.Button; 导入 android.widget.EditText; 导入 android.widget.TextView; @SuppressWarnings("未使用") 公共类起点扩展活动 按钮 bGuess; TextView点、提示、结果; EditText 猜测; 字符串 dog = "狗"; 字符串guessDog =guess.toString(); 整数点 = 0; boolean isDog = ((String) hintp).contains("有四条腿和毛皮"); boolean isFrog = ((String) hintp).contains("有四只脚,很粘"); 布尔错误; @覆盖 protected void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); setContentView(R.layout.activity_starting_point); bGuess = (Button) findViewById(R.id.bGuess); 点 = (TextView) findViewById(R.id.tPoints); 提示 = (TextView) findViewById(R.id.tHint); 结果 = (TextView) findViewById(R.id.tResult); 猜测 = (EditText) findViewById(R.id.eGuess); bGuess.setOnClickListener(new View.OnClickListener() @覆盖 公共无效 onClick(查看 v) // TODO 自动生成的方法存根 hint.setText("有四条腿和毛"); 如果(是狗) if ("dog".equals(guess.getText().toString())) 错误=假; hint.setText("有四只脚,黏糊糊的"); 别的 错误=真; 如果(isFrog) if ("frog".equals(guess.getText().toString())) 错误=假; 别的 错误=真; 如果(错误) 观点 - ; result.setText("假的再试一次"); points.setText("点数:" + point); 别的 点++; result.setText("正确"); points.setText("点数:" + point); );DDMS 线路:
04-04 08:30:28.194: I/DEBUG(31): debuggerd: Feb 3 2011 14:45:34
04-04 08:30:28.225: D/qemud(38): entering main loop
04-04 08:30:28.244: I/Vold(29): Vold 2.1 (the revenge) firing up
04-04 08:30:28.264: I/Netd(30): Netd 1.0 starting
04-04 08:30:28.274: D/Vold(29): USB mass storage support is not enabled in the kernel
04-04 08:30:28.274: D/Vold(29): usb_configuration switch is not enabled in the kernel
04-04 08:30:28.274: D/Vold(29): Volume sdcard state changing -1 (Initializing) -> 0 (No-Media)
04-04 08:30:28.504: D/Vold(29): Volume sdcard state changing 0 (No-Media) -> 1 (Idle-Unmounted)
04-04 08:30:28.565: D/qemud(38): fdhandler_accept_event: accepting on fd 9
04-04 08:30:28.565: D/qemud(38): created client 0xe078 listening on fd 10
04-04 08:30:28.565: D/qemud(38): client_fd_receive: attempting registration for service 'boot-properties'
04-04 08:30:28.565: D/qemud(38): client_fd_receive: -> received channel id 1
04-04 08:30:28.574: D/qemud(38): client_registration: registration succeeded for client 1
04-04 08:30:28.574: I/qemu-props(52): connected to 'boot-properties' qemud service.
04-04 08:30:28.574: I/qemu-props(52): receiving..
04-04 08:30:28.584: I/qemu-props(52): received: dalvik.vm.heapsize=32m
04-04 08:30:28.584: I/qemu-props(52): receiving..
04-04 08:30:28.584: I/qemu-props(52): received: qemu.sf.lcd_density=240
04-04 08:30:28.584: I/qemu-props(52): receiving..
04-04 08:30:28.584: I/qemu-props(52): received: qemu.hw.mainkeys=1
04-04 08:30:28.584: I/qemu-props(52): receiving..
04-04 08:30:28.584: I/qemu-props(52): received: qemu.sf.fake_camera=none
04-04 08:30:28.584: I/qemu-props(52): receiving..
04-04 08:30:28.584: I/qemu-props(52): exiting (4 properties set).
04-04 08:30:28.584: D/qemud(38): fdhandler_event: disconnect on fd 10
04-04 08:30:29.084: D/AndroidRuntime(33): >>>>>> AndroidRuntime START com.android.internal.os.ZygoteInit <<<<<<
04-04 08:30:29.084: D/AndroidRuntime(33): CheckJNI is ON
04-04 08:30:29.314: I/(34): ServiceManager: 0xad50
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_
android:layout_
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=".StartingPoint" >
<Button
android:id="@+id/bGuess"
android:layout_
android:layout_
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:text="Guess" />
<TextView
android:id="@+id/tPoints"
android:layout_
android:layout_
android:layout_alignParentTop="true"
android:layout_alignRight="@+id/bGuess"
android:text="Points: " />
<TextView
android:id="@+id/tResult"
android:layout_
android:layout_
android:layout_above="@+id/tHint"
android:layout_centerHorizontal="true"
android:layout_marginBottom="74dp"
android:text="Result: "
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="@+id/tHint"
android:layout_
android:layout_
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="Hint: \n"
android:textAppearance="?android:attr/textAppearanceLarge" />
<EditText
android:id="@+id/eGuess"
android:layout_
android:layout_
android:layout_above="@+id/bGuess"
android:layout_alignLeft="@+id/bGuess"
android:layout_alignRight="@+id/bGuess"
android:ems="10" />
</RelativeLayout>
【问题讨论】:
请提供一些您的活动代码。 请同时上传您的活动代码 你在StartingPoint.java:17
有NullPointerException
,那里有东西分配给NULL
。看看吧。
错误位于 Java 代码的第 17 行,com.random.stuff.StartingPoint。空指针异常也可能是引用错误 xml 组件的结果。发布您的代码以获得更好的答案。
抱歉,我在尝试添加现在存在的起点代码时出错
【参考方案1】:
因为String guessDog = guess.toString();
这条线,你正面临NullPointerExcetion
只需将其替换为String guessDog;
现在在 onClick() 方法上获取文本如下,
public void onClick(View v)
guessDog = guess.getText().toString(); // Add this line
.
.
这是我这边的更新代码,我在初始化时做了一些更改
我从 .xml 中删除了 @dimon 值,因为它不属于我(您可以将其保留在您的代码中) 我删除了这一行的提示,而是将直接值设为true
这是我的代码,
@SuppressWarnings("unused")
public class StartingPoint extends Activity
Button bGuess;
TextView points, hint, result;
EditText guess;
String dog = "Dog";
String guessDog;
int point = 0;
boolean isDog = true;
boolean isFrog = true;
boolean wrong;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_starting_point);
bGuess = (Button) findViewById(R.id.bGuess);
points = (TextView) findViewById(R.id.tPoints);
hint = (TextView) findViewById(R.id.tHint);
result = (TextView) findViewById(R.id.tResult);
guess = (EditText) findViewById(R.id.eGuess);
bGuess.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
guessDog = guess.toString();
// TODO Auto-generated method stub
hint.setText("Has four legs and fur");
if (isDog)
if ("dog".equals(guess.getText().toString()))
wrong = false;
hint.setText("Has four legs and is slimy");
else
wrong = true;
if (isFrog)
if ("frog".equals(guess.getText().toString()))
wrong = false;
else
wrong = true;
if (wrong)
point--;
result.setText("False try again");
points.setText("Points: " + point);
else
point++;
result.setText("Correct");
points.setText("Points: " + point);
);
【讨论】:
哦 Windows 7 和我构建的计算机 好的,不过我当时也这样做了,我必须安装什么应用程序 我必须在 Eclipse 中设置一些东西还是我只需按 Android 应用程序运行 好的,在您的设备上进行此设置,转到设置-> 应用程序-> 勾选“未知来源”,然后有另一个名为“开发”的选项选择它并勾选“USB 调试”。在此之后再次运行您的应用程序。 如何进入设置以上是关于Android应用程序不断崩溃的主要内容,如果未能解决你的问题,请参考以下文章