04-23 Android 课堂笔记

 1 //暂停
 2     @Override
 3     protected void onPause() {
 4         super.onPause();
 5         Log.e("TAG", "onPause()被调用");
 6     }
 7     //重新启动
 8     @Override
 9     protected void onRestart() {
10         super.onRestart();
11         Log.e("TAG", "onRestart()被调用");
12     }
13     //启动
14     @Override
15     protected void onStart() {
16         super.onStart();
17         Log.e("TAG", "onStart()被调用");
18     }
19     //停止
20     @Override
21     protected void onStop() {
22         super.onStop();
23         Log.e("TAG", "onStop()被调用");
24     }
25     //销毁
26     @Override
27     protected void onDestroy() {
28         super.onDestroy();
29         Log.e("TAG", "onDestroy()被调用");
30     }
31     //继续
32     @Override
33     protected void onResume() {
34         super.onResume();
35         Log.e("TAG", "onResume()被调用");
36     }

 1 //点击事件方法
 2     public void bt_onclick(View v)
 3     {
 4         //显示提示信息
 5         //方法链
 6 //        Toast toast = Toast.makeText();
 7 //        toast.show();
 8         Toast.makeText(TestActivity1.this, "消息发送成功", Toast.LENGTH_LONG).show();
 9     }
10 
11     public void close_onclick(View v)
12     {
13         //关闭activity
14         finish();
15     }

 1 <Button
 2             android:layout_width="0dp"
 3             android:layout_height="wrap_content"
 4             android:layout_weight="1"
 5             android:text="取消发送"
 6             android:textStyle="bold"
 7             android:onClick="close_onclick"
 8             />
 9         <Button
10             android:layout_width="0dp"
11             android:layout_height="wrap_content"
12             android:layout_weight="1"
13             android:text="发送短信"
14             android:textStyle="bold"
15             android:onClick="bt_onclick"
16             />

 1 //保存状态
 2     @Override
 3     public void onSaveInstanceState(Bundle outState) {
 4         super.onSaveInstanceState(outState);
 5         Log.e("TAG", "保存应用状态");
 6 
 7         outState.putString("et1",et1.getText().toString());
 8         outState.putString("et2",et2.getText().toString());
 9         outState.putString("et3",et3.getText().toString());
10     }
11     //恢复状态
12     @Override
13     protected void onRestoreInstanceState(Bundle savedInstanceState) {
14         super.onRestoreInstanceState(savedInstanceState);
15         Log.e("TAG", "恢复应用状态");
16 
17         et1.setText(savedInstanceState.getString("et1"));
18         et2.setText(savedInstanceState.getString("et2"));
19         et3.setText(savedInstanceState.getString("et3"));
20     }

 1 //成员变量
 2     EditText et1;
 3     EditText et2;
 4     EditText et3;
 5 et1 = (EditText)findViewById(R.id.et1);
 6         et2 = (EditText)findViewById(R.id.et2);
 7         et3 = (EditText)findViewById(R.id.et3);
 8 
 9         Log.e("TAG", "oncreate()被调用");
10 
11         if (savedInstanceState != null && !savedInstanceState.isEmpty()){
12             et1.setText(savedInstanceState.getString("et1")+"恢复之后的");
13             et2.setText(savedInstanceState.getString("et2")+"恢复之后的");
14             et3.setText(savedInstanceState.getString("et3")+"恢复之后的");
15         }