我的Android应用中有一个视频活动。 在proguard被禁用的调试版本中，所有工作都像魅力。 但是在发布版本中，当启用proguard并且视频活动开始时，我会获得NPE。
我的gradle文件的一部分：
buildTypes {
debug {
applicationIdSuffix '.dev'
versionNameSuffix '-dev'
minifyEnabled false
shrinkResources false
}
release {
minifyEnabled true
shrinkResources true
debuggable false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
signingConfig signingConfigs.release
}
}
例外：
java.lang.RuntimeException: Unable to start activity ComponentInfo{ua.com.tv24.news/ua.com.tv24.news.ui.activities.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.app.ActionBar.setTitle(java.lang.CharSequence)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.app.ActionBar.setTitle(java.lang.CharSequence)' on a null object reference
at ua.com.tv24.news.ui.fragments.a.b.a(Unknown Source)
at android.support.v4.app.Fragment.i(Unknown Source)
at android.support.v4.app.u.a(Unknown Source)
at android.support.v4.app.u.a(Unknown Source)
at android.support.v4.app.u.a(Unknown Source)
at android.support.v4.app.u.j(Unknown Source)
at android.support.v4.app.p.onCreate(Unknown Source)
at android.support.v7.app.ActionBarActivity.onCreate(Unknown Source)
at ua.com.tv24.news.ui.activities.a.onCreate(Unknown Source)
at ua.com.tv24.news.ui.activities.b.onCreate(Unknown Source)
at ua.com.tv24.news.ui.activities.MainActivity.onCreate(Unknown Source)
at android.app.Activity.performCreate(Activity.java:5933)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
我的活动：
package ua.com.tv24.news.ui.activities;
import android.content.res.Resources;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.Parcel;
import android.os.Parcelable;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.FrameLayout;
import com.google.android.libraries.mediaframework.exoplayerextensions.Video;
import com.google.android.libraries.mediaframework.layeredvideo.PlaybackControlLayer;
import com.google.googlemediaframework.adplayer.ImaPlayer;
import de.greenrobot.event.EventBus;
import ua.com.tv24.news.R;
import ua.com.tv24.news.events.ui.VideoPreparedEvent;
public class DashVideoActivity extends ActionBarActivity implements PlaybackControlLayer.FullscreenCallback {
private ImaPlayer imaPlayer;
private FrameLayout videoPlayerContainer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
EventBus.getDefault().register(this);
setContentView(R.layout.activity_dash_video);
videoPlayerContainer = (FrameLayout) findViewById(R.id.video_frame);
Bundle bundle = getIntent().getExtras();
String videoUrl = bundle.getString(VideoActivity.VIDEO_URL_EXTRA);
String appName = getString(R.string.app_name);
//TODO get url and name from extras
VideoItem video = new VideoItem(appName, new Video(videoUrl, Video.VideoType.DASH, ""),
null);
createImaPlayer(video);
}
@Override
protected void onResume() {
super.onResume();
if (imaPlayer != null) {
imaPlayer.play();
}
}
@Override
protected void onPause() {
if (imaPlayer != null) {
imaPlayer.pause();
}
super.onPause();
}
@Override
protected void onDestroy() {
if (imaPlayer != null) {
imaPlayer.release();
}
EventBus.getDefault().unregister(this);
super.onDestroy();
}
public void createImaPlayer(VideoItem videoListItem) {
if (imaPlayer != null) {
imaPlayer.release();
}
// If there was previously a video player in the container, remove it.
videoPlayerContainer.removeAllViews();
String adTagUrl = videoListItem.adUrl;
String videoTitle = videoListItem.title;
imaPlayer = new ImaPlayer(this,
videoPlayerContainer,
videoListItem.video,
videoTitle,
adTagUrl);
imaPlayer.setFullscreenCallback(this);
Resources res = getResources();
Drawable logo = res.getDrawable(R.drawable.launcher);
imaPlayer.setLogoImage(logo);
imaPlayer.play();
}
@Override
public void onGoToFullscreen() {
}
@Override
public void onReturnFromFullscreen() {
}
public static class VideoItem implements Parcelable {
/**
* The title of the video.
*/
public final String title;
/**
* The actual content video (contains its URL, media type - either DASH or mp4,
* and an optional media type).
*/
public final Video video;
/**
* The URL of the VAST document which represents the ad.
*/
public final String adUrl;
/**
* @param title The title of the video.
* @param video The actual content video (contains its URL, media type - either DASH or mp4,
* and an optional media type).
* @param adUrl The URL of the VAST document which represents the ad.
*/
public VideoItem(String title, Video video, String adUrl) {
this.title = title;
this.video = video;
this.adUrl = adUrl;
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
}
}
public void onEventMainThread(VideoPreparedEvent event) {
View progress = findViewById(R.id.videoLoaderBar);
if (progress != null) {
progress.setVisibility(View.INVISIBLE);
}
}
}
我的计划也是：
-dontwarn com.google.android.gms.**
# Picasso
-dontwarn com.squareup.okhttp.**
-keep class * extends java.util.ListResourceBundle {
protected Object[][] getContents();
}
-keep public class com.google.android.gms.common.internal.safeparcel.SafeParcelable {
public static final *** NULL;
}
-keepnames @com.google.android.gms.common.annotation.KeepName class *
-keepclassmembernames class * {
@com.google.android.gms.common.annotation.KeepName *;
}
-keepnames class * implements android.os.Parcelable {
public static final ** CREATOR;
}
#okhttp
-keepnames class com.levelup.http.okhttp.** { *; }
-keepnames interface com.levelup.http.okhttp.** { *; }
-keepnames class com.squareup.okhttp.** { *; }
-keepnames interface com.squareup.okhttp.** { *; }
-dontwarn com.squareup.okhttp.internal.http.*
-dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
#retrofit
-keepattributes Signature
-keepattributes *Annotation*
-keep class com.google.gson.** { *; }
-keep class com.google.inject.** { *; }
-keep class org.apache.http.* { *; }
-keep class org.apache.james.mime4j.* { *; }
-keep class javax.inject.** { *; }
-dontwarn rx.*
-keep class com.example.testobfuscation.** { *; }
-keepattributes Signature
-keep class sun.misc.Unsafe { *; }
-keep class retrofit.** { *; }
-keep interface retrofit.** { *; }
-keepclasseswithmembers class * {
@retrofit.http.* <methods>;
}
-keepclasseswithmembers class * {
@ua.* <methods>;
}
-dontwarn retrofit.appengine.**
-keep class ua.com.tv24.news.models.** { *; }
-keepattributes InnerClasses
#xml parser
-keep interface org.simpleframework.xml.** { *; }
-keep class org.simpleframework.xml.** { *; }
#eventBus
-keepclassmembers class ** {
public void onEvent(**);
}
-keepclassmembers class ** {
public void onEventMainThread(**);
}
#support v7
-keep class android.support.v7.** { *; }
#unusage classes
-dontwarn retrofit.appengine.UrlFetchClient
-dontwarn retrofit.RxSupport$1
-dontwarn com.google.ads.a.a
-dontwarn com.google.ads.a.c
-dontwarn com.google.ads.a.d
-dontwarn com.google.ads.a.f
-dontwarn com.google.android.exoplayer.hls.HlsMediaPlaylistParser
-dontwarn okio.DeflaterSink
-dontwarn org.simpleframework.xml.stream.StreamProvider
-dontwarn okio.Okio
-dontwarn org.simpleframework.xml.stream.StreamReader
-dontwarn org.simpleframework.xml.stream.StreamReader$Entry
-dontwarn org.simpleframework.xml.stream.StreamReader$Start
-dontwarn org.simpleframework.xml.stream.StreamReader$Text
-dontwarn retrofit.RestMethodInfo$RxSupport
-dontwarn retrofit.RxSupport
-dontwarn retrofit.RxSupport$2
答案 0 :(得分：6)
Taker关注您从ProGuard处理中排除了类和方法：
# Hide warnings about references to newer platforms in the library
-dontwarn android.support.v7.**
# don't process support library
-keep class android.support.v7.** { *; }
-keep interface android.support.v7.** { *; }
如果涉及Reflection，通常会发生错误，因为在这种情况下Proguard无法解析依赖关系。
我只是看到你错过了ProGuard文件中的界面（根据例外情况）：
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method ...