利用 LeakCanary 来检查 Android 内存泄漏

关于利用 LeakCanary 来检查 Android 内存泄漏

第一步：添加依赖

dependencies {
   debugCompile 'com.squareup.leakcanary:leakcanary-android:1.5'
   releaseCompile 'com.squareup.leakcanary:leakcanary-android-no-op:1.5'
   testCompile 'com.squareup.leakcanary:leakcanary-android-no-op:1.5'
 }

第二步：在application类中初始化LeakCanary

import android.app.Application;
import android.content.Context;
import com.squareup.leakcanary.LeakCanary;
import com.squareup.leakcanary.RefWatcher;

/**
 * Created by Administrator on 2017/1/18.
 */

public class MyApplication extends Application {

    /**
     * ActivityRefWatcher 来监控 Activity 泄漏。即当 Activity.onDestroy() 被调用之后，
     * 如果这个 Activity 没有被销毁，logcat 就会打印出如下信息告诉你内存泄漏发生了。
     * @param context
     * @return
     */
    public static RefWatcher getRefWatcher(Context context){
        MyApplication myApplication= (MyApplication) context.getApplicationContext();
        return myApplication.refWatcher;
    }
    private RefWatcher refWatcher;
        @Override
        public void onCreate() {
            super.onCreate();
            //初始化refWatcher
            refWatcher=LeakCanary.install(this);
        }
}

第三步：在AndroidManifest.xml使用上一步的application类

    <application
　　　　　//此处使用自定义的application类
        android:name=".MyApplication"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".SecondActivity"></activity>
    </application>

第四步：在activity中使用LeakCanary来监测内存泄漏情况，在onCreate()方法中初始化

//<!-- LeakCanary -->
//应用初始Activity中加入如下两行代码
RefWatcher refWatcher = UILApplication.getRefWatcher(this);
refWatcher.watch(this);
//<!-- LeakCanary -->

　　在Fragment中监控泄漏

public abstract class BaseFragment extends Fragment {

    @Override 
    public void onDestroy() {
        super.onDestroy();
        RefWatcher refWatcher = ExampleApplication.getRefWatcher(getActivity());
        refWatcher.watch(this);
    }
}

OK，完成了，如果有内存泄露的话就会自动提示，上效果图。

测试代码：静态变量引用非静态资源就很容易引起内存泄漏

public class SecondActivity extends AppCompatActivity {
    static Demo sDemo;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
        RefWatcher refWatcher=MyApplication.getRefWatcher(this);
        refWatcher.watch(this);
        if (sDemo == null) {
            sDemo = new Demo();
        }
        finish();
    }

    class Demo
    {
        void doSomething()
        {
            System.out.print("===============dosth.==========");
        }
    }
}

参考资料：

http://blog.csdn.net/jie1991liu/article/details/49927865

http://www.jianshu.com/p/0049e9b344b0

http://blog.csdn.net/jie1991liu/article/details/49927865