内存泄漏的检测;leakCanary

一.导入依赖

debugCompile 'com.squareup.leakcanary:leakcanary-android:1.3'

二.新建一个类继承application并在清单文件中注册.初始化观察

public class MyApplication extends Application {
    private static final String TAG = "MyApplication";
    private RefWatcher ref;

    //创建一个静态方法,用于返回RefWatcher对象
    public static RefWatcher getRefWatcher(Context context) {
        
        MyApplication myapplication= (MyApplication) context.getApplicationContext();
        return myapplication.ref;
    }
    @Override
    public void onCreate() {
        super.onCreate();
        //创建RefWatcher实例
        ref= LeakCanary.install(this);
    }
}

三定义一个基类,在基类中监听,这样所有子类都可以监听到了

public class BaseFragment extends Fragment {
    private static final String TAG = "BaseFragment";

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //拿到检测对象
        RefWatcher refWatcher = MyApplication.getRefWatcher(getContext());
        //进行检测
        refWatcher.watch(this);
    }
}

四.新建一个实例,造成内存泄漏的情况

public class AppFragment extends BaseFragment {
    private static final String TAG = "HomeFragment";
    private static Demo demo;
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        TextView textView=new TextView(getContext());
        textView.setText("sdfs");
        demo=new Demo();
        return textView;
    }

    class Demo{

    }
}

五.执行

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

    }

    public void go(View view) {
        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
        transaction.replace(R.id.container,new AppFragment())
                .commit();

    }
}