Activity生命周期

Activity 生命周期 android Markdown

Activity的开启

activity首次启动：执行顺序onCreate——>onStart——>onResume

截图

package com.river.activitylife;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.i("life", "MainActivity onCreate");
    }

    public void loadSecond(View view) {
        startActivity(new Intent(this, SecondActivity.class));
    }

    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        Log.i("life", "MainActivity onDestroy");
    }

    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        Log.i("life", "MainActivity onResume");
    }

    @Override
    protected void onStart() {
        // TODO Auto-generated method stub
        super.onStart();
        Log.i("life", "MainActivity onStart");
    }

    @Override
    protected void onStop() {
        // TODO Auto-generated method stub
        super.onStop();
        Log.i("life", "MainActivity onStop");
    }

    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
        Log.i("life", "MainActivity onPause");
    }

    @Override
    protected void onRestart() {
        // TODO Auto-generated method stub
        super.onRestart();
        Log.i("life", "MainActivity onRestart");
    }

}

Activity结束（按返回键）

activity结束：执行顺序：自身onPause——>自身onStop——>自身onDestroy

截图

Activity跳转到其他Activity

activity跳转到其他Activity：执行顺序：自身onPause——>其他onCreate——>其他

截图

package com.river.activitylife;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;

public class SecondActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
        Log.i("life", "SecondActivity onCreate");
    }

    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        Log.i("life", "SecondActivity onDestroy");
    }

    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
        Log.i("life", "SecondActivity onPause");
    }

    @Override
    protected void onRestart() {
        // TODO Auto-generated method stub
        super.onRestart();
        Log.i("life", "SecondActivity onRestart");
    }

    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        Log.i("life", "SecondActivity onResume");
    }

    @Override
    protected void onStart() {
        // TODO Auto-generated method stub
        super.onStart();
        Log.i("life", "SecondActivity onStart");
    }

    @Override
    protected void onStop() {
        // TODO Auto-generated method stub
        super.onStop();
        Log.i("life", "SecondActivity onStop");
    }

}

Activity跳转到主Activity

activity跳转到主Activity：执行顺序：最好看图 

截图