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'
 }

public class MyApplication extends Application {
 @Override
 public void onCreate() {
  super.onCreate();

  if (LeakCanary.isInAnalyzerProcess(this)) {
   // This process is dedicated to LeakCanary for heap analysis.
   // You should not init your app in this process.
   return;
  }
  LeakCanary.install(this);

  // 你的其他代码从下面开始
 }
}

package com.github.pandafang.leakcanarytest;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.SystemClock;
import android.view.View;

public class MainActivity extends Activity {

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


 View button = findViewById(R.id.async_task);
 button.setOnClickListener(new View.OnClickListener() {
  @Override public void onClick(View v) {
  startAsyncTask();
  }
 });
 }


 void startAsyncTask() {
 // This async task is an anonymous class and therefore has a hidden reference to the outer
 // class MainActivity. If the activity gets destroyed before the task finishes (e.g. rotation),
 // the activity instance will leak.
 new AsyncTask<Void, Void, Void>() {
  @Override protected Void doInBackground(Void... params) {
  // Do some slow work in background
  SystemClock.sleep(20000);
  return null;
  }
 }.execute();
 }
}