你的位置:首页 > 操作系统

[操作系统]android Activity生命周期的例子


package com.example.yanlei.yl2;import android.app.AlertDialog;import android.content.DialogInterface;import android.content.DialogInterface.OnKeyListener;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.widget.TextView;public class MainActivity extends AppCompatActivity {  public static final String TAG = "生命周期:";  String Str = "";  TextView pTextView = null;  @Override  public void onCreate(Bundle savedInstanceState) {    //当创建此Activity的时候回调    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    Log.e(TAG, "onCreate");    try {      Str = Str + "创建:\n";      pTextView.setText(Str);    } catch (Exception e) {      //Log.e(TAG, "error : "+e.getMessage(), e);    }  }  @Override  protected void onDestroy() {    //当销毁此Activity的时候回调    super.onDestroy();    Log.e(TAG, "onDestroy");    try {      Str = Str + "摧毁:\n";      pTextView.setText(Str);    } catch (Exception e) {      //Log.e(TAG, "error : "+e.getMessage(), e);    }  }  @Override  protected void onPause() {    //当暂停此Activity的时候回调    super.onPause();    Log.e(TAG, "onPause");    try {      Str = Str + "暂停:\n";      pTextView.setText(Str);    } catch (Exception e) {      // Log.e(TAG, "error : "+e.getMessage(), e);    }  }  @Override  protected void onRestart() {    //当重新开始此Activity的时候回调    super.onRestart();    Log.e(TAG, "onRestart");    try    {      Str = Str + "重新启动:\n";      pTextView.setText(Str);    } catch (Exception e) {      //Log.e(TAG, "error : "+e.getMessage(), e);    }  }  @Override  protected void onResume() {    //当显示展示此Activity的界面的时候回调    super.onResume();    Log.e(TAG, "onResume");    try {      Str = Str + "继续:\n";      pTextView.setText(Str);    } catch (Exception e) {      //Log.e(TAG, "error : "+e.getMessage(), e);    }  }  @Override  protected void onStart() {    //当使用此Activity可以接受用户操作的时候回调    super.onStart();    Log.e(TAG, "onStart");    try {      Str = Str + "开始:\n";      pTextView.setText(Str);    } catch (Exception e) {      //Log.e(TAG, "error : "+e.getMessage(), e);    }  }  @Override  protected void onStop() {    //当停止此Activity的时候回调    super.onStop();    Log.e(TAG, "onStop");    try {      Str = Str + "停止:\n";      pTextView.setText(Str);    } catch (Exception e) {      //Log.e(TAG, "error : "+e.getMessage(), e);    }  }}

日志如下:

onCreate
onStart
onResume

onPause
onStop
onDestroy