Android按返回键（后退键）Back键事件捕获的两种方法

package zhangphil.back;

import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.KeyEvent;
import android.os.Bundle;

public class MainActivity extends ActionBarActivity {

    // 打印事件的标签
    private final String TAG = "Phil";

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

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

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

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

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

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

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

    // 捕获返回键的方法1
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
            // 按下BACK，同时没有重复
            Log.d(TAG, "onKeyDown()");
        }

        return super.onKeyDown(keyCode, event);
    }

    // 捕获返回键的方法2
    @Override
    public void onBackPressed() {
        Log.d(TAG, "onBackPressed()");
        super.onBackPressed();
    }
}