Activity生命周期验证

最新推荐文章于 2024-06-17 15:08:19 发布

原创最新推荐文章于 2024-06-17 15:08:19 发布 · 1.5k 阅读

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本文通过一个简单的示例项目，详细介绍了Android中Activity的生命周期方法及其调用顺序。通过日志打印的方式直观展示从Activity创建到销毁过程中各生命周期方法的执行情况。

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Activity作为Android四大组件之一，其生命周期是Android开发最基础也是最易混淆的知识，为了更为清晰辨别Activity生命周期方法运行过程，简单验证如下：

package woodknife.com.androidbase;

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

public class LifecycleActivity extends Activity {
    public static final String TAG = "Lifecycle";
    private void showMsg(String msg){
        Toast.makeText(LifecycleActivity.this, msg, Toast.LENGTH_SHORT).show();
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_lifecycle);
        Log.d(TAG,"onCreate");
//        showMsg("onCreate");
    }

    @Override
    protected void onStart() {
        super.onStart();
        Log.d(TAG,"onStart");
//        showMsg("onStart");
    }

    @Override
    protected void onResume() {
        super.onResume();
        Log.d(TAG,"onResume");
//        showMsg("onResume");
    }

    @Override
    protected void onPause() {
        super.onPause();
        Log.d(TAG,"onPause");
//        showMsg("onPause");
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        Log.d(TAG,"onSaveInstanceState");
//        showMsg("onSaveInstanceState");
    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        Log.d(TAG,"onRestoreInstanceState");
//        showMsg("onRestoreInstanceState");
    }

    @Override
    protected void onStop() {
        super.onStop();
        Log.d(TAG,"onStop");
//        showMsg("onStop");
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.d(TAG,"onDestroy");
//        showMsg("onDestroy");
    }

    @Override
    protected void onRestart() {
        super.onRestart();
        Log.d(TAG,"onRestart");
//        showMsg("onRestart");
    }
}