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+package com.yexue.android.rrxjava;
+
+import android.content.Intent;
+import android.support.v7.app.AppCompatActivity;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.View;
+import android.widget.Button;
+import android.widget.TextView;
+
+import rx.Observable;
+import rx.Observer;
+import rx.Subscriber;
+import rx.functions.Action1;
+
+public class MainActivity extends AppCompatActivity {
+    private static String tag = "MainActivityLOG";
+
+    TextView te;
+    Button toMap, toHttp, btn3, btn4, btn5, btn6;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+        te = (TextView) findViewById(R.id.te);
+        toMap = (Button) findViewById(R.id.toMap);
+        toHttp = (Button) findViewById(R.id.toHttp);
+        btn3 = (Button) findViewById(R.id.btn3);
+        btn4 = (Button) findViewById(R.id.btn4);
+        btn5 = (Button) findViewById(R.id.btn5);
+        btn6 = (Button) findViewById(R.id.btn6);
+
+        method0();
+        toMap.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                startActivity(new Intent(MainActivity.this, MapActivity.class));
+            }
+        });
+        toHttp.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                startActivity(new Intent(MainActivity.this, HttpActivity.class));
+            }
+        });
+        btn3.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                startActivity(new Intent(MainActivity.this, ActionActivity.class));
+            }
+        });
+        btn4.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                startActivity(new Intent(MainActivity.this, TestActivity.class));
+            }
+        });
+    }
+
+    public void method0() {
+        /**
+         * 观察者
+         */
+        Observer<String> observer = new Observer<String>() {
+            @Override
+            public void onCompleted() {
+                Log.d(tag, "Completed!");
+            }
+
+            @Override
+            public void onError(Throwable e) {
+                Log.d(tag, "Error!");
+            }
+
+            @Override
+            public void onNext(String s) {
+                Log.d(tag, "Item: " + s);
+            }
+        };
+        /**
+         * 订阅内容
+         */
+        Subscriber<String> subscriber = new Subscriber<String>() {
+            @Override
+            public void onCompleted() {
+                Log.d(tag, ">>>Completed!");
+            }
+
+            @Override
+            public void onError(Throwable e) {
+                Log.d(tag, ">>>Error!");
+            }
+
+            @Override
+            public void onNext(String s) {
+                Log.d(tag, ">>>Item: " + s);
+            }
+        };
+        /**
+         * 被观察者
+         */
+        Observable observable = Observable.create(new Observable.OnSubscribe<String>() {
+            @Override
+            public void call(Subscriber<? super String> subscriber) {
+                subscriber.onNext("Hello");
+                subscriber.onNext("Hi");
+                subscriber.onNext("Aloha");
+                subscriber.onCompleted();
+            }
+        });
+        //关联订阅
+        //订阅观察者的事件
+        observable.subscribe(observer);
+        //直接订阅事件
+        observable.subscribe(subscriber);
+    }
+
+    /**
+     * 原理
+     */
+    public void method1() {
+        //创建 Observable--被观察者 对象
+        Observable<String> observable = Observable.create(new Observable.OnSubscribe<String>() {
+            @Override
+            public void call(Subscriber<? super String> subscriber) {
+                subscriber.onNext("Hello world RxJava");
+                subscriber.onCompleted();
+            }
+        });
+        //订阅内容
+        Subscriber subscriber = new Subscriber() {
+            @Override
+            public void onCompleted() {
+
+            }
+
+            @Override
+            public void onError(Throwable e) {
+
+            }
+
+            @Override
+            public void onNext(Object o) {
+                te.setText(o.toString());
+            }
+        };
+        //将Observable和Subscriber相关联，即完成subscriber和observable的订阅
+        observable.subscribe(subscriber);
+    }
+
+    /**
+     * 原理
+     */
+    public void method2() {
+        //被观察者
+        Observable<String> observable = Observable.just("简化 RXJAVA");
+        //订阅
+        Action1<String> onNextAction = new Action1<String>() {
+            @Override
+            public void call(String s) {
+                te.setText(s);
+            }
+        };
+        //关联
+        observable.subscribe(onNextAction);
+    }
+
+    /**
+     * 正常写法
+     */
+    public void method3() {
+        Observable.just("更简化 De RxJava").subscribe(new Action1<String>() {
+            @Override
+            public void call(String s) {
+                te.setText(s);
+            }
+        });
+    }
+}