問題描述

每次啟動這個activity memory allocated 逐漸增加，且不會被回收求解決方案，下面是具體實現

public class NetWork { private static AuthApi authApi; private static UserApi userApi; private static Converter.Factory gsonConverterFactory= GsonConverterFactory.create(); private static CallAdapter.Factory rxJavaCallAdapterFactory= RxJavaCallAdapterFactory.create(); public static AuthApi getAuthApi(){Log.d('NetWork', 'authApi==null:' + (authApi == null));if(authApi == null){ Retrofit retrofit=new Retrofit.Builder() .baseUrl(UrlConfig.ACCESS_TOKEN) .addCallAdapterFactory(rxJavaCallAdapterFactory) .addConverterFactory(gsonConverterFactory) .build(); authApi=retrofit.create(AuthApi.class);}return authApi; } public static UserApi getUserApi(){Log.d('NetWork', 'userApi==null:' + (userApi == null));if(userApi == null){ Retrofit retrofit=new Retrofit.Builder() .baseUrl(UrlConfig.BASE_URL) .addCallAdapterFactory(rxJavaCallAdapterFactory) .addConverterFactory(gsonConverterFactory) .build(); userApi=retrofit.create(UserApi.class);}return userApi; }}

public class OAuthLoginActivity extends AppCompatActivity { private WebViewProgress mWebView; Subscription mSubscription; Subscription mProgressSubscription; @Override protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_oauth);initView();/** 1.getCode client_id scope* 2.getToken client_id client_secret code* */mWebView.loadUrl(UrlConfig.LOGIN_URL);Log.d('webViewURL',mWebView.getUrl()); } @Override protected void onDestroy() {super.onDestroy();mWebView.removeAllViews();mWebView.destroy();if(mSubscription!=null){ mSubscription.unsubscribe();}if(mProgressSubscription!=null){ mProgressSubscription.unsubscribe();} } @Override public boolean onOptionsItemSelected(MenuItem item) {switch (item.getItemId()){ case android.R.id.home:finish();return true;}return super.onOptionsItemSelected(item); } class MyWebViewClient extends WebViewClient{@Overridepublic void onPageStarted(WebView view, String url, Bitmap favicon) { super.onPageStarted(view, url, favicon); Log.d('MyWebViewClient', url); if(url.contains('?code=')){Uri uri=Uri.parse(url);String code=uri.getQueryParameter('code');getUser(code); }}@Overridepublic void onPageFinished(WebView view, String url) { super.onPageFinished(view, url); mProgressSubscription=Observable.timer(1, TimeUnit.SECONDS) .observeOn(AndroidSchedulers.mainThread()) .subscribe(new Action1<Long>() {@Overridepublic void call(Long aLong) { mWebView.mProgressBar.setVisibility(View.GONE);} });} } private void initView(){Toolbar toolbar=(Toolbar) findViewById(R.id.toolbar);mWebView=(WebViewProgress) findViewById(R.id.web_view);toolbar.setTitle('授權登錄');setSupportActionBar(toolbar);getSupportActionBar().setDisplayHomeAsUpEnabled(true);WebSettings webSettings=mWebView.getSettings();webSettings.setJavaScriptEnabled(true);webSettings.setSupportZoom(true);webSettings.setBuiltInZoomControls(true);webSettings.setCacheMode(WebSettings.LOAD_NO_CACHE);mWebView.requestFocusFromTouch();mWebView.setWebViewClient(new MyWebViewClient()); } private void getUser(String code){mSubscription=NetWork.getAuthApi().getAccessToken(UrlConfig.CLIENT_ID,UrlConfig.CLIENT_SECRET,code).flatMap(new Func1<AccessToken, Observable<User>>() { @Override public Observable<User> call(AccessToken accessToken) {return NetWork.getUserApi().getUser(accessToken.getAccess_token()); }}).subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread()).subscribe(new Observer<User>() { @Override public void onCompleted() {Log.d('OAuthLoginActivity', 'completed'); } @Override public void onError(Throwable e) {Log.d('OAuthLoginActivity', 'e:' + e); } @Override public void onNext(User user) {Log.d('OK',user.getLogin());Toast.makeText(OAuthLoginActivity.this, user.getLogin(), Toast.LENGTH_SHORT).show(); }}); }}

問題解答

補充：感謝@DOS提醒，增加LayoutParams布局參數設置。

你可以試試我的方法：

不要在布局文件中聲明<WebView>,改成在Activity中創建 如，WebView mWebView = new WebView(this);

在布局文件中用容器類布局，比如FrameLayout作為WebView的容器，在Activity中主動把WebView添加到容器中。

在OnDestory()中移除、銷毀WebView。

舉個例子吧：我們用FrameLayout作為WebView的父容器

1： 使用容器包裹WebView

<FrameLayout android: android:layout_width='fill_parent' android:layout_height='wrap_content'/>

2：在Activity中創建WebView，在OnDestroy()方法中從容器中移除、銷毀WebView

public class MyActivity extends Activity { private FrameLayout mContainer; private WebView mWebView; @Override protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState); ... mContainer = (FrameLayout) findViewById(R.id.container);mWebView = new WebView(this);ViewGroup.LayoutParams params = new ViewGroup.LayoutParams( ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);mWebView.setLayoutParams(p);mContainer.addView(mWebView); } @Override protected void onDestroy() {super.onDestroy();mContainer.removeAllViews();mWebView.destroy(); }}

之所以這么做的原因是在XML文件中創建WebView,會把Activity作為Context傳給WebView，而不是Application Context。所以在finishingActivity的時候，WebView任然持有Activity引用，導致Activity無法被回收。更多詳情，戳這里

樓主可以使用MAT分析一下，具體是哪個對象在持有Activity對象，然后在就可以定位到問題了。

再加個：獨立進程