Activity的生命周期

package blue.boki.com.emojidemo;import android.app.Activity;import android.content.Intent;import android.support.v7.app.ActionBarActivity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.widget.Button;import android.widget.Toast;public class LifeActivity extends Activity implements View.OnClickListener{    private Button btn;    @Override创建的时候被调用    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_life);        Toast.makeText(this,"onCreate",Toast.LENGTH_LONG).show();        btn = (Button) findViewById(R.id.btn);        btn.setOnClickListener(this);    }创建或者后台重新回到前台时期调用    protected void onStart(){        super.onStart();        Toast.makeText(this,"onStart",Toast.LENGTH_LONG).show();    }从后台重新回到前台时被调用    protected void onRestart() {        super.onRestart();        Toast.makeText(this,"onRestart",Toast.LENGTH_LONG).show();    }创建、覆盖、后台重新回到前台时被调用    protected void onResume() {        super.onResume();        Toast.makeText(this,"onResume",Toast.LENGTH_LONG).show();    }覆盖到下面或者锁屏时被调用    protected void onPause() {        super.onPause();        Toast.makeText(this,"onPause",Toast.LENGTH_LONG).show();    }退出，或者跳转    protected void onStop() {        super.onStop();        Toast.makeText(this,"onStop",Toast.LENGTH_LONG).show();    }退出当前Activity,调用之后的Activity    protected void onDestroy() {        super.onDestroy();        Toast.makeText(this,"onDestroy",Toast.LENGTH_LONG).show();    }    @Override    public void onClick(View v) {        Intent intent = new Intent(this,ApplyActivity.class);        startActivity(intent);    }}