Android App Keeps Crashing
我打开Android应用程序时一直出错
The application app_name(process com.random.stuff) has stopped unexpectedly.
Please try again
logcat的
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | 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 ComponentInfo{com.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 |
初始点:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 | package com.thenewboston.joseph; import android.os.Bundle; import android.app.Activity; import android.text.Editable; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; @SuppressWarnings("unused") public class StartingPoint extends Activity { Button bGuess; TextView points, hint, result; EditText guess; String dog ="Dog"; String guessDog = guess.toString(); int point = 0; boolean isDog = ((String) hintp).contains("Has four legs and fur"); boolean isFrog = ((String) hintp).contains("Has four legs and is slimy"); 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) { // 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); } } }); } } |
DDMS线:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 | 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_width="match_parent" android:layout_height="match_parent" 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_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true" android:layout_alignParentRight="true" android:text="Guess" /> <TextView android:id="@+id/tPoints" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_alignRight="@+id/bGuess" android:text="Points:" /> <TextView android:id="@+id/tResult" android:layout_width="wrap_content" android:layout_height="wrap_content" 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_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_centerVertical="true" android:text="Hint: " android:textAppearance="?android:attr/textAppearanceLarge" /> <EditText android:id="@+id/eGuess" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_above="@+id/bGuess" android:layout_alignLeft="@+id/bGuess" android:layout_alignRight="@+id/bGuess" android:ems="10" /> </RelativeLayout> |
由于此行
只需用
现在获取onClick()方法的文本,如下所示,
1 2 3 4 | public void onClick(View v) { guessDog = guess.getText().toString(); // Add this line . . |
这是我方面的更新代码,我做了一些初始更改
- 我从.xml中移除了@dimon值,因为它不在我身边(你可以把它保存在你的代码中)
-
我删除了这一行的hintp而不是直接给出了
true 的值
这是我的代码,
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 | @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); } } }); } } |