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我正在使用底部抽屉导航开发 WorldNews Android 应用程序，但是，我收到以下异常。
Process: yodgobekkomilov.edgar.com.worldnews, PID: 4478
java.lang.RuntimeException: Unable to start activity ComponentInfo{yodgobekkomilov.edgar.com.worldnews/yodgobekkomilov.edgar.com.worldnews.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.AppCompatImageView.setImageDrawable(android.graphics.drawable.Drawable)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2778)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.AppCompatImageView.setImageDrawable(android.graphics.drawable.Drawable)' on a null object reference
at me.riddhimanadib.library.BottomNavigationBar.<init>(BottomNavigationBar.java:65)
at me.riddhimanadib.library.BottomBarHolderActivity.setupBottomBarHolderActivity(BottomBarHolderActivity.java:36)
at yodgobekkomilov.edgar.com.worldnews.MainActivity.onCreate(MainActivity.java:54)
at android.app.Activity.performCreate(Activity.java:7009)
at android.app.Activity.performCreate(Activity.java:7000)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2731)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
2018-10-01 19:31:35.214 1393-1440/? E/IPCThreadState: binder thread pool (4 threads) starved for 203 ms
2018-10-01 19:31:35.215 1575-1588/? E/memtrack: Couldn't load memtrack module
2018-10-01 19:31:35.519 1393-1440/? E/IPCThreadState: binder thread pool (4 threads) starved for 105 ms
2018-10-01 19:31:35.712 1575-1592/? E/BatteryExternalStatsWorker: modem info is invalid: ModemActivityInfo{ mTimestamp=0 mSleepTimeMs=0 mIdleTimeMs=0 mTxTimeMs[]=[0, 0, 0, 0, 0] mRxTimeMs=0 mEnergyUsed=0}
2018-10-01 19:31:35.812 1450-1450/? E/AudioFlinger: not enough memory for AudioTrack size=131296
2018-10-01 19:31:35.812 1450-1450/? E/AudioFlinger: createRecordTrack_l() initCheck failed -12; no control block?
2018-10-01 19:31:35.814 2574-4505/? E/AudioRecord: AudioFlinger could not create record track, status: -12
2018-10-01 19:31:35.827 2574-4505/? E/AudioRecord-JNI: Error creating AudioRecord instance: initialization check failed with status -12.
2018-10-01 19:31:35.827 2574-4505/? E/android.media.AudioRecord: Error code -20 when initializing native AudioRecord object.
2018-10-01 19:31:35.828 2574-4505/? E/ActivityThread: Failed to find provider info for com.google.android.apps.gsa.testing.ui.audio.recorded
2018-10-01 19:31:42.172 1450-1536/? E/AudioFlinger: not enough memory for AudioTrack size=131296
2018-10-01 19:31:42.172 1450-1536/? E/AudioFlinger: createRecordTrack_l() initCheck failed -12; no control block?
2018-10-01 19:31:42.172 2574-4505/? E/AudioRecord: AudioFlinger could not create record track, status: -12
2018-10-01 19:31:42.188 2574-4505/? E/AudioRecord-JNI: Error creating AudioRecord instance: initialization check failed with status -12.
2018-10-01 19:31:42.189 2574-4505/? E/android.media.AudioRecord: Error code -20 when initializing native AudioRecord object.
2018-10-01 19:31:42.245 2574-4505/? E/ActivityThread: Failed to find provider info for com.google.android.apps.gsa.testing.ui.audio.recorded
2018-10-01 19:31:42.333 1575-1588/? E/memtrack: Couldn't load memtrack module
2018-10-01 19:31:46.110 1575-1588/? E/memtrack: Couldn't load memtrack module
2018-10-01 19:31:47.638 1450-1536/? E/AudioFlinger: not enough memory for AudioTrack size=131296
2018-10-01 19:31:47.638 1450-1536/? E/AudioFlinger: createRecordTrack_l() initCheck failed -12; no control block?
2018-10-01 19:31:47.638 2574-4505/? E/AudioRecord: AudioFlinger could not create record track, status: -12
2018-10-01 19:31:47.672 2574-4505/? E/AudioRecord-JNI: Error creating AudioRecord instance: initialization check failed with status -12.
2018-10-01 19:31:47.672 2574-4505/? E/android.media.AudioRecord: Error code -20 when initializing native AudioRecord object.
2018-10-01 19:31:47.673 2574-4505/? E/ActivityThread: Failed to find provider info for com.google.android.apps.gsa.testing.ui.audio.recorded
2018-10-01 19:31:48.001 1575-1588/? E/memtrack: Couldn't load memtrack module
2018-10-01 19:31:48.758 1575-1671/? E/TaskPersister: File error accessing recents directory (directory doesn't exist?).
2018-10-01 19:31:52.885 1450-1536/? E/AudioFlinger: not enough memory for AudioTrack size=131296
2018-10-01 19:31:52.885 1450-1536/? E/AudioFlinger: createRecordTrack_l() initCheck failed -12; no control block?
2018-10-01 19:31:52.886 2574-4505/? E/AudioRecord: AudioFlinger could not create record track, status: -12
2018-10-01 19:31:52.904 2574-4505/? E/AudioRecord-JNI: Error creating AudioRecord instance: initialization check failed with status -12.
2018-10-01 19:31:52.904 2574-4505/? E/android.media.AudioRecord: Error code -20 when initializing native AudioRecord object.
2018-10-01 19:31:52.918 2574-4505/? E/ActivityThread: Failed to find provider info for com.google.android.apps.gsa.testing.ui.audio.recorded
2018-10-01 19:31:58.384 1450-1450/? E/AudioFlinger: not enough memory for AudioTrack size=131296
2018-10-01 19:31:58.384 1450-1450/? E/AudioFlinger: createRecordTrack_l() initCheck failed -12; no control block?
2018-10-01 19:31:58.395 2574-4505/? E/AudioRecord: AudioFlinger could not create record track, status: -12
2018-10-01 19:31:58.445 2574-4505/? E/AudioRecord-JNI: Error creating AudioRecord instance: initialization check failed with status -12.
2018-10-01 19:31:58.446 2574-4505/? E/android.media.AudioRecord: Error code -20 when initializing native AudioRecord object.
2018-10-01 19:31:58.449 2574-4505/? E/ActivityThread: Failed to find provider info for com.google.android.apps.gsa.testing.ui.audio.recorded
2018-10-01 19:32:00.006 1575-1588/? E/memtrack: Couldn't load memtrack module
2018-10-01 19:32:03.819 1575-1588/? E/memtrack: Couldn't load memtrack module
2018-10-01 19:32:03.858 1450-1450/? E/AudioFlinger: not enough memory for AudioTrack size=131296
2018-10-01 19:32:03.859 1450-1450/? E/AudioFlinger: createRecordTrack_l() initCheck failed -12; no control block?
2018-10-01 19:32:03.859 2574-4505/? E/AudioRecord: AudioFlinger could not create record track, status: -12
2018-10-01 19:32:03.866 2574-4505/? E/AudioRecord-JNI: Error creating AudioRecord instance: initialization check failed with status -12.
2018-10-01 19:32:03.866 2574-4505/? E/android.media.AudioRecord: Error code -20 when initializing native AudioRecord object.
2018-10-01 19:32:03.869 2574-4505/? E/ActivityThread: Failed to find provider info for com.google.android.apps.gsa.testing.ui.audio.recorded
2018-10-01 19:32:04.054 1575-1592/? E/BatteryExternalStatsWorker: modem info is invalid: ModemActivityInfo{ mTimestamp=0 mSleepTimeMs=0 mIdleTimeMs=0 mTxTimeMs[]=[0, 0, 0, 0, 0] mRxTimeMs=0 mEnergyUsed=0}
2018-10-01 19:32:04.073 1575-1588/? E/memtrack: Couldn't load memtrack module
2018-10-01 19:32:05.145 2365-2465/? E/AsyncOpDispatcher: Could not get module info from current context.
java.lang.IllegalStateException: Unable to get current module info in ModuleManager created with non-module Context
at com.google.android.chimera.config.ModuleManager.getCurrentModule(:com.google.android.gms@13280022@13.2.80 (040700-211705629):2)
at wwj.b(:com.google.android.gms@13280022@13.2.80 (040700-211705629):1)
at wwj.<init>(:com.google.android.gms@13280022@13.2.80 (040700-211705629):8)
at wwj.a(:com.google.android.gms@13280022@13.2.80 (040700-211705629):9)
at com.google.android.gms.icing.mdd.service.DataDownloadChimeraService.a(:com.google.android.gms@13280022@13.2.80 (040700-211705629):14)
at wwd.a(:com.google.android.gms@13280022@13.2.80 (040700-211705629):26)
at pmz.a(:com.google.android.gms@13280022@13.2.80 (040700-211705629):46)
at pnh.a(:com.google.android.gms@13280022@13.2.80 (040700-211705629):110)
at pbi.run(:com.google.android.gms@13280022@13.2.80 (040700-211705629):8)
at android.os.Handler.handleCallback(Handler.java:790)
at android.os.Handler.dispatchMessage(Handler.java:99)
在 My MainActivity.java 下面，我遇到了异常。
public class MainActivity extends BottomBarHolderActivity implements AllJazeeraFragment.OnFragmentInteractionListener, BBCFragment.OnFragmentInteractionListener, CNNFragment.OnFragmentInteractionListener, CBCNewsFragment.OnFragmentInteractionListener {
// private ApiService apiService;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR);
setContentView(R.layout.activity_main);
NavigationPage page1 = new NavigationPage("AllJazeera", ContextCompat.getDrawable(this, R.drawable.alljazeera), AllJazeeraFragment.newInstance());
NavigationPage page2 = new NavigationPage("Support", ContextCompat.getDrawable(this, R.drawable.bbc_icon), CNNFragment.newInstance());
NavigationPage page3 = new NavigationPage("Billing", ContextCompat.getDrawable(this, R.drawable.cnn_icon), AllJazeeraFragment.newInstance());
NavigationPage page4 = new NavigationPage("Profile", ContextCompat.getDrawable(this, R.drawable.cbc_icon), CBCNewsFragment.newInstance());
List<NavigationPage> navigationPages = new ArrayList<>();
navigationPages.add(page1);
navigationPages.add(page2);
navigationPages.add(page3);
navigationPages.add(page4);
super.setupBottomBarHolderActivity(navigationPages);
}
public void onClicked() {
Toast.makeText(this, "Clicked!", Toast.LENGTH_SHORT).show();
}
}
最佳答案
更改 build.gradle 文件，将 minifyEnabled 设置为 false 即可工作
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
在 proguard-rules.pro 文件中添加以下行，该文件将出现在\app 文件夹中
-keep class android.support.v7.widget.** { *; }
像这样
# Add project specific ProGuard rules here.
# You can control the set of applied configuration files using the
# proguardFiles setting in build.gradle.
#
# For more details, see
# http://developer.android.com/guide/developing/tools/proguard.html
# If your project uses WebView with JS, uncomment the following
# and specify the fully qualified class name to the JavaScript interface
# class:
#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
# public *;
#}
# Uncomment this to preserve the line number information for
# debugging stack traces.
#-keepattributes SourceFile,LineNumberTable
# If you keep the line number information, uncomment this to
# hide the original source file name.
#-renamesourcefileattribute SourceFile
-keep class android.support.v7.widget.** { *; }
希望这会起作用......!
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