1.调用
//暂停
@Override
protected void onPause() {
super.onPause();
Log.e("TAG", "onPause()被调用");
}
//重新启动
@Override
protected void onRestart() {
super.onRestart();
Log.e("TAG", "onRestart()被调用");
}
//启动
@Override
protected void onStart() {
super.onStart();
Log.e("TAG", "onStart()被调用");
}
//停止
@Override
protected void onStop() {
super.onStop();
Log.e("TAG", "onStop()被调用");
}
//销毁
@Override
protected void onDestroy() {
super.onDestroy();
Log.e("TAG", "onDestroy()被调用");
}
//继续
@Override
protected void onResume() {
super.onResume();
Log.e("TAG", "onResume()被调用");
}
运行情况如下:
[博主笔记本电脑内存容量略低,只能用真机运行]
【一、这是真机刚运行时的日志反馈】
【二、旋转屏幕时的日志反馈】
2、显示提示信息
【JAVA类中添加代码】
//点击事件方法
public void bt_onclick(View v)
{
//显示提示信息
//方法链
// Toast toast = Toast.makeText();
// toast.show();
Toast.makeText(TestActivity1.this, "消息发送成功", Toast.LENGTH_LONG).show();
} public void close_onclick(View v)
{
//关闭activity
finish();
}
【添加在xml文件中的代码】
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="取消发送"
android:textStyle="bold"
android:onClick="close_onclick"
/>
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="发送短信"
android:textStyle="bold"
android:onClick="bt_onclick"
/>
(输入Toast后在出现的提示框中选择没有图标的。)
3.状态的保存应用
【日志输出】
//保存状态
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
Log.e("TAG", "保存应用状态"); outState.putString("et1",et1.getText().toString());
outState.putString("et2",et2.getText().toString());
outState.putString("et3",et3.getText().toString());
}
//恢复状态
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
Log.e("TAG", "恢复应用状态"); et1.setText(savedInstanceState.getString("et1"));
et2.setText(savedInstanceState.getString("et2"));
et3.setText(savedInstanceState.getString("et3"));
}
日志输出内容:
//成员变量
EditText et1;
EditText et2;
EditText et3;
et1 = (EditText)findViewById(R.id.et1);
et2 = (EditText)findViewById(R.id.et2);
et3 = (EditText)findViewById(R.id.et3); Log.e("TAG", "oncreate()被调用"); if (savedInstanceState != null && !savedInstanceState.isEmpty()){
et1.setText(savedInstanceState.getString("et1")+"恢复之后的");
et2.setText(savedInstanceState.getString("et2")+"恢复之后的");
et3.setText(savedInstanceState.getString("et3")+"恢复之后的");
}