1.左右Activity生命周期的若干条款：

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training课程给的图是这种：

2.执行官方的程序

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看到AActivity进入到onStop方法中。而BActivity则进入到onResume方法中。对应的运行顺序：AActivity接着上面的onResume方法运行了onPause方法，接着BActivity运行了：onCreate--->onStart--->onResume进入到Resumed状态，然后A到了onStop状态，此时点击Start Cbutton：我们看到AActivity和BActivity分别进入到Stopped状态，CActivity进入到Resumed状态。相同运行顺序和上面的类似，不再说明，例如以下图：

此时，点击Dialogbutton：

我们看到CActivity进入到Paused状态，说明：在Paused状态下，Activity是能够是半透明的，而不一定全然不可视。点击close关闭Dialog，CActivity进入到Resumed状态，此时点击Finish C:我们看到CActivity运行了onPause--->onDestory进入到Destroyed方法。

点击Finish B。和上面的一样的流程，在AActivity的界面上，我们按下小房子。然后再进入：

此时我们分析的就差点儿相同了，旋转屏幕相同会带来生命周期的变化。

3.分析源代码：

AActivity:

package com.dystu.activitylifecycle;

import android.content.Intent;

import android.support.v7.app.ActionBarActivity;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.widget.TextView;

import com.dystu.activitylifecycle.utils.StatusTracker;

import com.dystu.activitylifecycle.utils.Utils;

public class AActivity extends ActionBarActivity {

    private String mActivityName;

    private TextView mStatusView;

    private TextView mStatusAllView;

    private StatusTracker mStatusTracker = StatusTracker.getInstance();

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_a);

        mActivityName = getString(R.string.activity_a);

        mStatusView = (TextView)findViewById(R.id.status_view_a);

        mStatusAllView = (TextView)findViewById(R.id.status_view_all_a);

        mStatusTracker.setStatus(mActivityName, getString(R.string.on_create));

        Utils.printStatus(mStatusView, mStatusAllView);

    }

    @Override

    protected void onStart() {

        super.onStart();

        mStatusTracker.setStatus(mActivityName, getString(R.string.on_start));

        Utils.printStatus(mStatusView, mStatusAllView);

    }

    @Override

    protected void onRestart() {

        super.onRestart();

        mStatusTracker.setStatus(mActivityName, getString(R.string.on_restart));

        Utils.printStatus(mStatusView, mStatusAllView);

    }

    @Override

    protected void onResume() {

        super.onResume();

        mStatusTracker.setStatus(mActivityName, getString(R.string.on_resume));

        Utils.printStatus(mStatusView, mStatusAllView);

    }

    @Override

    protected void onPause() {

        super.onPause();

        mStatusTracker.setStatus(mActivityName, getString(R.string.on_pause));

        Utils.printStatus(mStatusView, mStatusAllView);

    }

    @Override

    protected void onStop() {

        super.onStop();

        mStatusTracker.setStatus(mActivityName, getString(R.string.on_stop));

    }

    @Override

    protected void onDestroy() {

        super.onDestroy();

        mStatusTracker.setStatus(mActivityName, getString(R.string.on_destroy));

        mStatusTracker.clear();

    }

    public void startDialog(View v) {

        Intent intent = new Intent(AActivity.this, DialogActivity.class);

        startActivity(intent);

    }

    public void startActivityB(View v) {

        Intent intent = new Intent(AActivity.this, BActivity.class);

        startActivity(intent);

    }

    public void startActivityC(View v) {

        Intent intent = new Intent(AActivity.this, CActivity.class);

        startActivity(intent);

    }

    public void finishActivityA(View v) {

        AActivity.this.finish();

    }

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.menu_a, menu);

        return true;

    }

    @Override

    public boolean onOptionsItemSelected(MenuItem item) {

        // Handle action bar item clicks here. The action bar will

        // automatically handle clicks on the Home/Up button, so long

        // as you specify a parent activity in AndroidManifest.xml.

        int id = item.getItemId();

        //noinspection SimplifiableIfStatement

        if (id == R.id.action_settings) {

            return true;

        }

        return super.onOptionsItemSelected(item);

    }

}