您好，我正在开发可以拍摄所有照片并对其进行评分的应用程序，现在我的 CustomView 有问题（不知道如何很好地使用自定义视图），这就是我想要做的：
现在这是我在调用自定义视图函数之后喜欢的代码：
MainActivity.java：
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_start);
layout = new Layout();
new Events(layout);
}
Layout layout;
public class Layout{
public Layout()
{
btnStartMeinu = (Button)findViewById(R.id.btnStartMeinu);
}
Button btnStartMeinu;
}
public class Events{
public Events(Layout layout){
layout.btnStartMeinu.setOnClickListener(new btnStart_OnClick());
}
class btnStart_OnClick implements OnClickListener {
@Override
public void onClick(View view) {
btn_OnClick(view);
}
}
}
void btn_OnClick(View view){
Intent intent = new Intent(this, MainMenuActivity.class);
startActivity(intent);
}
}
MainMenuActivity.java: addCostumView(); - 调用自定义视图
public class MainMenuActivity extends Activity {
Layout layout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maine_menu);
layout = new Layout();
new Events(layout);
addCostumView();
}
public class Layout{
public Layout(){
linearLayout = (LinearLayout)findViewById(R.id.linearlayout1);
}
LinearLayout linearLayout;
}
public class Events{
public Events(Layout layout){
}
}
public void addCostumView(){
// LinearLayout layout = new LinearLayout(this);
for(int i = 1; i<10 ; i++)
{
CustomView custom = new CustomView(null, null);
// changes to yours custom view
layout.linearLayout.addView(custom);
}
}
}
自定义视图.java：
public class CustomView extends LinearLayout{
public CustomView(Context context, AttributeSet attrs)
{
super(context, attrs);
LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
inflater.inflate(R.layout.costum_view_photos, this);
Button btn1 = (Button)findViewById(R.id.btn1);
}
}
日志猫：
10-12 13:13:53.531 277-490/system_process I/ActivityManager: START u0 {cmp=com.example.photosnetwork/.MainMenuActivity} from pid 838
10-12 13:13:53.541 277-490/system_process W/WindowManager: Failure taking screenshot for (246x410) to layer 21015
10-12 13:13:53.751 838-838/com.example.photosnetwork D/dalvikvm: GC_FOR_ALLOC freed 52K, 7% free 2658K/2832K, paused 28ms, total 38ms
10-12 13:13:53.761 838-838/com.example.photosnetwork I/dalvikvm-heap: Grow heap (frag case) to 3.318MB for 635812-byte allocation
10-12 13:13:53.861 838-847/com.example.photosnetwork D/dalvikvm: GC_FOR_ALLOC freed 6K, 6% free 3273K/3456K, paused 101ms, total 101ms
10-12 13:13:53.992 838-840/com.example.photosnetwork D/dalvikvm: GC_CONCURRENT freed <1K, 6% free 3278K/3456K, paused 3ms+89ms, total 131ms
10-12 13:13:54.001 838-838/com.example.photosnetwork D/AndroidRuntime: Shutting down VM
10-12 13:13:54.001 838-838/com.example.photosnetwork W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0x40a71930)
10-12 13:13:54.031 838-838/com.example.photosnetwork E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.photosnetwork/com.example.photosnetwork.MainMenuActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
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:5041)
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.NullPointerException
at android.view.ViewConfiguration.get(ViewConfiguration.java:318)
at android.view.View.<init>(View.java:3236)
at android.view.View.<init>(View.java:3281)
at android.view.ViewGroup.<init>(ViewGroup.java:431)
at android.widget.LinearLayout.<init>(LinearLayout.java:176)
at android.widget.LinearLayout.<init>(LinearLayout.java:172)
at com.example.photosnetwork.CustomView.<init>(CustomView.java:13)
at com.example.photosnetwork.MainMenuActivity.addCostumView(MainMenuActivity.java:37)
at com.example.photosnetwork.MainMenuActivity.onCreate(MainMenuActivity.java:20)
at android.app.Activity.performCreate(Activity.java:5104)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
... 11 more
10-12 13:13:54.051 277-378/system_process D/SystemClock: Setting time of day to sec=1381583644
10-12 13:14:04.222 277-378/system_process W/SystemClock: Unable to set rtc to 1381583644: Invalid argument
10-12 13:14:04.367 277-289/system_process W/ActivityManager: Force finishing activity com.example.photosnetwork/.MainMenuActivity
10-12 13:14:04.367 277-289/system_process W/ActivityManager: Force finishing activity com.example.photosnetwork/.MainActivity
10-12 13:14:04.507 277-294/system_process D/dalvikvm: GC_FOR_ALLOC freed 287K, 19% free 6323K/7720K, paused 59ms, total 64ms
10-12 13:14:04.507 277-294/system_process I/dalvikvm-heap: Grow heap (frag case) to 6.902MB for 635812-byte allocation
10-12 13:14:04.587 277-855/system_process D/dalvikvm: GC_FOR_ALLOC freed 12K, 17% free 6931K/8344K, paused 69ms, total 69ms
10-12 13:14:04.867 37-85/? E/SurfaceFlinger: ro.sf.lcd_density must be defined as a build property
10-12 13:14:04.877 277-291/system_process W/ActivityManager: Activity pause timeout for ActivityRecord{410d9980 u0 com.example.photosnetwork/.MainMenuActivity}
10-12 13:14:05.367 594-609/com.android.deskclock V/AlarmClock: No next alarm
10-12 13:14:05.377 594-609/com.android.deskclock V/AlarmClock: AlarmInitReceiver finished
10-12 13:14:05.507 594-594/com.android.deskclock I/Choreographer: Skipped 112 frames! The application may be doing too much work on its main thread.
10-12 13:14:05.587 37-312/? E/SurfaceFlinger: ro.sf.lcd_density must be defined as a build property
10-12 13:14:10.897 619-637/com.android.exchange D/ExchangeService: Received deviceId from Email app: null
10-12 13:14:10.897 619-637/com.android.exchange D/ExchangeService: !!! deviceId unknown; stopping self and retrying
10-12 13:14:11.218 277-277/system_process I/AudioService: AudioFocus abandonAudioFocus() from android.media.AudioManager@40ce9818com.android.music.MediaPlaybackService$3@40ce8438
10-12 13:14:15.829 277-291/system_process W/ActivityManager: Activity destroy timeout for ActivityRecord{41042a30 u0 com.example.photosnetwork/.MainActivity}
10-12 13:14:15.829 277-291/system_process W/ActivityManager: Activity destroy timeout for ActivityRecord{410d9980 u0 com.example.photosnetwork/.MainMenuActivity}
10-12 13:14:15.926 619-619/com.android.exchange D/ExchangeService: !!! EAS ExchangeService, onStartCommand, startingUp = false, running = false
10-12 13:14:15.936 277-414/system_process W/ActivityManager: Unable to start service Intent { act=com.android.email.ACCOUNT_INTENT } U=0: not found
10-12 13:14:15.936 619-636/com.android.exchange D/ExchangeService: !!! Email application not found; stopping self
10-12 13:14:15.946 277-288/system_process W/ActivityManager: Unable to start service Intent { act=com.android.email.ACCOUNT_INTENT } U=0: not found
10-12 13:14:15.967 619-619/com.android.exchange E/ActivityThread: Service com.android.exchange.ExchangeService has leaked ServiceConnection com.android.emailcommon.service.ServiceProxy$ProxyConnection@40d04ec8 that was originally bound here
android.app.ServiceConnectionLeaked: Service com.android.exchange.ExchangeService has leaked ServiceConnection com.android.emailcommon.service.ServiceProxy$ProxyConnection@40d04ec8 that was originally bound here
at android.app.LoadedApk$ServiceDispatcher.<init>(LoadedApk.java:969)
at android.app.LoadedApk.getServiceDispatcher(LoadedApk.java:863)
at android.app.ContextImpl.bindService(ContextImpl.java:1418)
at android.app.ContextImpl.bindService(ContextImpl.java:1407)
at android.content.ContextWrapper.bindService(ContextWrapper.java:473)
at com.android.emailcommon.service.ServiceProxy.setTask(ServiceProxy.java:157)
at com.android.emailcommon.service.ServiceProxy.setTask(ServiceProxy.java:145)
at com.android.emailcommon.service.AccountServiceProxy.getDeviceId(AccountServiceProxy.java:116)
at com.android.exchange.ExchangeService.getDeviceId(ExchangeService.java:1249)
at com.android.exchange.ExchangeService$7.run(ExchangeService.java:1856)
at com.android.emailcommon.utility.Utility$2.doInBackground(Utility.java:551)
at com.android.emailcommon.utility.Utility$2.doInBackground(Utility.java:549)
at android.os.AsyncTask$2.call(AsyncTask.java:287)
at java.util.concurrent.FutureTask.run(FutureTask.java:234)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
at java.lang.Thread.run(Thread.java:856)
10-12 13:14:15.976 619-619/com.android.exchange E/StrictMode: null
android.app.ServiceConnectionLeaked: Service com.android.exchange.ExchangeService has leaked ServiceConnection com.android.emailcommon.service.ServiceProxy$ProxyConnection@40d04ec8 that was originally bound here
at android.app.LoadedApk$ServiceDispatcher.<init>(LoadedApk.java:969)
at android.app.LoadedApk.getServiceDispatcher(LoadedApk.java:863)
at android.app.ContextImpl.bindService(ContextImpl.java:1418)
at android.app.ContextImpl.bindService(ContextImpl.java:1407)
at android.content.ContextWrapper.bindService(ContextWrapper.java:473)
at com.android.emailcommon.service.ServiceProxy.setTask(ServiceProxy.java:157)
at com.android.emailcommon.service.ServiceProxy.setTask(ServiceProxy.java:145)
at com.android.emailcommon.service.AccountServiceProxy.getDeviceId(AccountServiceProxy.java:116)
at com.android.exchange.ExchangeService.getDeviceId(ExchangeService.java:1249)
at com.android.exchange.ExchangeService$7.run(ExchangeService.java:1856)
at com.android.emailcommon.utility.Utility$2.doInBackground(Utility.java:551)
at com.android.emailcommon.utility.Utility$2.doInBackground(Utility.java:549)
at android.os.AsyncTask$2.call(AsyncTask.java:287)
at java.util.concurrent.FutureTask.run(FutureTask.java:234)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
at java.lang.Thread.run(Thread.java:856)
10-12 13:14:15.976 277-277/system_process W/ActivityManager: Unbind failed: could not find connection for android.os.BinderProxy@4103efd8
10-12 13:14:15.987 619-619/com.android.exchange E/ActivityThread: Service com.android.exchange.ExchangeService has leaked ServiceConnection com.android.emailcommon.service.ServiceProxy$ProxyConnection@40d04b20 that was originally bound here
android.app.ServiceConnectionLeaked: Service com.android.exchange.ExchangeService has leaked ServiceConnection com.android.emailcommon.service.ServiceProxy$ProxyConnection@40d04b20 that was originally bound here
at android.app.LoadedApk$ServiceDispatcher.<init>(LoadedApk.java:969)
at android.app.LoadedApk.getServiceDispatcher(LoadedApk.java:863)
at android.app.ContextImpl.bindService(ContextImpl.java:1418)
at android.app.ContextImpl.bindService(ContextImpl.java:1407)
at android.content.ContextWrapper.bindService(ContextWrapper.java:473)
at com.android.emailcommon.service.ServiceProxy.setTask(ServiceProxy.java:157)
at com.android.emailcommon.service.ServiceProxy.setTask(ServiceProxy.java:145)
at com.android.emailcommon.service.ServiceProxy.test(ServiceProxy.java:191)
at com.android.exchange.ExchangeService$7.run(ExchangeService.java:1850)
at com.android.emailcommon.utility.Utility$2.doInBackground(Utility.java:551)
at com.android.emailcommon.utility.Utility$2.doInBackground(Utility.java:549)
at android.os.AsyncTask$2.call(AsyncTask.java:287)
at java.util.concurrent.FutureTask.run(FutureTask.java:234)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
at java.lang.Thread.run(Thread.java:856)
10-12 13:14:15.996 619-619/com.android.exchange E/StrictMode: null
android.app.ServiceConnectionLeaked: Service com.android.exchange.ExchangeService has leaked ServiceConnection com.android.emailcommon.service.ServiceProxy$ProxyConnection@40d04b20 that was originally bound here
at android.app.LoadedApk$ServiceDispatcher.<init>(LoadedApk.java:969)
at android.app.LoadedApk.getServiceDispatcher(LoadedApk.java:863)
at android.app.ContextImpl.bindService(ContextImpl.java:1418)
at android.app.ContextImpl.bindService(ContextImpl.java:1407)
at android.content.ContextWrapper.bindService(ContextWrapper.java:473)
at com.android.emailcommon.service.ServiceProxy.setTask(ServiceProxy.java:157)
at com.android.emailcommon.service.ServiceProxy.setTask(ServiceProxy.java:145)
at com.android.emailcommon.service.ServiceProxy.test(ServiceProxy.java:191)
at com.android.exchange.ExchangeService$7.run(ExchangeService.java:1850)
at com.android.emailcommon.utility.Utility$2.doInBackground(Utility.java:551)
at com.android.emailcommon.utility.Utility$2.doInBackground(Utility.java:549)
at android.os.AsyncTask$2.call(AsyncTask.java:287)
at java.util.concurrent.FutureTask.run(FutureTask.java:234)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
at java.lang.Thread.run(Thread.java:856)
10-12 13:14:15.996 277-288/system_process W/ActivityManager: Unbind failed: could not find connection for android.os.BinderProxy@41073ad8