android Toast,Intent,响应选项，上下文菜单

1、Toast 收到某一事件时 将信息在屏幕上显示一段时间后消失

Toast.makeText(this, getResources().getString(R.string.hello),Toast.LENGTH_LONG).show();

 

2、Intent 意图的跳转

Intent intent1 = new Intent(this, AccountAddActivity.class);

 

3、获取上下文菜单

public void onCreateContextMenu(ContextMenu menu, View v,
   ContextMenuInfo menuInfo) {
  // MenuInfalter类用于从Menu资源文件中获取菜单
  MenuInflater inflater = getMenuInflater();
  inflater.inflate(R.menu.context_menu_main, menu);
  super.onCreateContextMenu(menu, v, menuInfo);
 }

 

4、获取选项菜单

@Override
 public boolean onCreateOptionsMenu(Menu menu) {
  // MenuInfalter类用于从Menu资源文件中获取菜单
  MenuInflater inflater = getMenuInflater();
  inflater.inflate(R.menu.options_menu, menu);
  return super.onCreateOptionsMenu(menu);
 }

5、响应上下文菜单

public boolean onMenuItemSelected(int featureId, MenuItem item) {
  // 获取上下文菜单所关联的数据项信息
  AdapterContextMenuInfo info = (AdapterContextMenuInfo) item
    .getMenuInfo();

 switch (item.getItemId()) {
  case R.id.menu_edit:

6、响应选项菜单

public boolean onOptionsItemSelected(MenuItem item) {
  switch (item.getItemId()) {