Activity--生命周期-优快云博客

本文通过一个简单的Android应用程序实例，详细解析了Activity的生命周期方法调用流程。从启动应用到切换及关闭活动，记录并展示了各个生命周期回调方法的执行顺序。

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

public class FirstActivity extends Activity {
    
    private static final String LOG_TAG="VERBOSE";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button b = (Button) findViewById(R.id.start);
        b.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(FirstActivity.this, SecondActivity.class);
                startActivity(intent);
            }
        });
        Log.v(LOG_TAG, "FirstActivity:onCreate");
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.v(LOG_TAG, "FirstActivity:onDestroy");
    }

    @Override
    protected void onPause() {
        super.onPause();
        Log.v(LOG_TAG, "FirstActivity:onPause");
    }

    @Override
    protected void onResume() {
        super.onResume();
        Log.v(LOG_TAG, "FirstActivity:onResume");
    }
    
    @Override
    protected void onRestart() {
        super.onRestart();
        Log.v(LOG_TAG, "FirstActivity:onRestart");
    }

    @Override
    protected void onStart() {
        super.onStart();
        Log.v(LOG_TAG, "FirstActivity:onStart");
    }

    @Override
    protected void onStop() {
        super.onStop();
        Log.v(LOG_TAG, "FirstActivity:onStop");
    }
    
}

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

public class SecondActivity extends Activity {
    
    private static final String LOG_TAG="VERBOSE";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.second);
        Button b = (Button) findViewById(R.id.back);
        b.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                finish();
            }
        });
        Button s = (Button) findViewById(R.id.start3);
        s.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(SecondActivity.this, ThirdActivity.class);
                startActivity(intent);
            }
        });
        Log.v(LOG_TAG, "SecondActivity:onCreate");
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.v(LOG_TAG, "SecondActivity:onDestroy");
    }

    @Override
    protected void onPause() {
        super.onPause();
        Log.v(LOG_TAG, "SecondActivity:onPause");
    }

    @Override
    protected void onRestart() {
        super.onRestart();
        Log.v(LOG_TAG, "SecondActivity:onRestart");
    }

    @Override
    protected void onResume() {
        super.onResume();
        Log.v(LOG_TAG, "SecondActivity:onResume");
    }

    @Override
    protected void onStart() {
        super.onStart();
        Log.v(LOG_TAG, "SecondActivity:onStart");
    }

    @Override
    protected void onStop() {
        super.onStop();
        Log.v(LOG_TAG, "SecondActivity:onStop");
    }
}