質問編集履歴
2
手直し
title
CHANGED
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File without changes
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body
CHANGED
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@@ -3,20 +3,20 @@
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3
3
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public class MainActivity extends Activity implements Runnable{
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4
4
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5
5
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private Handler mHandler = new Handler();
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6
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-
CanvasView cv;
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6
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+
CanvasView cv = new CanvasView(this);
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7
7
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8
8
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@Override
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9
9
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protected void onCreate(Bundle savedInstanceState){
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10
10
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super.onCreate(savedInstanceState);
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11
11
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setContentView(R.layout.activity_main);
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12
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-
setContentView(
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12
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+
setContentView(cv);
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13
13
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mHandler.postDelayed(this, 1000);
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14
14
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}
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15
15
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16
16
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public void run(){
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17
17
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cv.x += 5;
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18
18
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cv.y += 5;
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19
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-
setContentView(
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19
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+
setContentView(cv);
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20
20
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mHandler.postDelayed(this, 1000);
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21
21
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}
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22
22
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}
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1
付けたし
title
CHANGED
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File without changes
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body
CHANGED
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@@ -47,4 +47,35 @@
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47
47
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円を動かすプログラムを作ろうと思い、上記のようなプログラムを作りました。
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48
48
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エラーはないのですが、エミュレーターで実行すると「問題が発生したため、○○を終了します」とでて終わってしまいます。
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49
49
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プログラムがおかしいからなのだとは思うのですが、
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50
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-
何が原因なのでしょうか？
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50
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+
何が原因なのでしょうか？
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51
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+
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52
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+
LogCatの内容
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53
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+
error opening trace file: No such file or directory (2)
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54
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+
setTargetHeapUtilization:0.25
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55
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+
setTargetHeapIdealFree:8388608
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56
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+
setTargetHeapConcurrentStart:2097152
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57
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+
Shutting down VM
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58
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+
threadid=1: thread exiting with uncaught exception (group=0x40b4a450)
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59
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+
FATAL EXCEPTION: main
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60
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+
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.fireworks/com.example.fireworks.MainActivity}: java.lang.NullPointerException
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61
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+
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1994)
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62
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+
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2095)
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63
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+
at android.app.ActivityThread.access$600(ActivityThread.java:137)
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64
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+
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1206)
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65
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+
at android.os.Handler.dispatchMessage(Handler.java:99)
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66
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+
at android.os.Looper.loop(Looper.java:213)
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67
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+
at android.app.ActivityThread.main(ActivityThread.java:4786)
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68
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+
at java.lang.reflect.Method.invokeNative(Native Method)
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69
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+
at java.lang.reflect.Method.invoke(Method.java:511)
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70
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+
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
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71
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+
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)
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72
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+
at dalvik.system.NativeStart.main(Native Method)
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73
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+
Caused by: java.lang.NullPointerException
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74
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+
at android.content.ContextWrapper.getResources(ContextWrapper.java:81)
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75
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+
at android.view.View.<init>(View.java:3284)
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76
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+
at com.example.fireworks.CanvasView.<init>(CanvasView.java:17)
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77
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+
at com.example.fireworks.MainActivity.<init>(MainActivity.java:12)
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78
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+
at java.lang.Class.newInstanceImpl(Native Method)
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79
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+
at java.lang.Class.newInstance(Class.java:1319)
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80
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+
at android.app.Instrumentation.newActivity(Instrumentation.java:1053)
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81
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+
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1985)
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