Android Activity life circle brief

package com.tutor.activitydemo;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
public class ActivityDemo extends Activity {
   
    private static final String TAG = "ActivityDemo";
    
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        Log.e(TAG, "start onCreate~~~");
    }
    
    @Override
    protected void onStart() {
        super.onStart();
        Log.e(TAG, "start onStart~~~");
    }
    
    @Override
    protected void onRestart() {
        super.onRestart();
        Log.e(TAG, "start onRestart~~~");
    }
    
    @Override
    protected void onResume() {
        super.onResume();
        Log.e(TAG, "start onResume~~~");
    }
    
    @Override
    protected void onPause() {
        super.onPause();
        Log.e(TAG, "start onPause~~~");
    }
    
    @Override
    protected void onStop() {
        super.onStop();
        Log.e(TAG, "start onStop~~~");
    }
    
    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.e(TAG, "start onDestroy~~~");
    }
    
}

OPEN: onCreate()->onStart()->onResume()

BACK: onPause()->onStop()->onDestory()

HOME: onPause()->onStop()

come back: onRestart()->onStart()->onResume()

package com.tutor.activitydemo;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.EditText;
public class ActivityDemo extends Activity {
   
    private static final String TAG = "ActivityDemo";
    private EditText mEditText;
    //定义一个String 类型用来存取我们EditText输入的值
    private String mString;
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mEditText = (EditText)findViewById(R.id.editText);
        Log.e(TAG, "start onCreate~~~");
    }
    
    @Override
    protected void onStart() {
        super.onStart();
        Log.e(TAG, "start onStart~~~");
    }
    //当按HOME键时，然后再次启动应用时，我们要恢复先前状态
    @Override
    protected void onRestart() {
        super.onRestart();
        mEditText.setText(mString);
        Log.e(TAG, "start onRestart~~~");
    }
    
    @Override
    protected void onResume() {
        super.onResume();
        Log.e(TAG, "start onResume~~~");
    }
    
    //当我们按HOME键时，我在onPause方法里，将输入的值赋给mString
    @Override
    protected void onPause() {
        super.onPause();
        mString = mEditText.getText().toString();
        Log.e(TAG, "start onPause~~~");
    }
    
    @Override
    protected void onStop() {
        super.onStop();
        Log.e(TAG, "start onStop~~~");
    }
    
    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.e(TAG, "start onDestroy~~~");
    }
    
}

 via