Android 提示框 toast AlertDialog

核心提示：//带图标的menumenu.add(0, ITEM_2_ID, 1, “item-2″).setIcon(R.drawable.editbills2);menu.add(0, ITEM_3_ID, 2, “item-3″).setIcon(R.drawable.billsum1);return true;}publi

//带图标的menu

menu.add(0, ITEM_2_ID, 1, “item-2″).setIcon(R.drawable.editbills2);

menu.add(0, ITEM_3_ID, 2, “item-3″).setIcon(R.drawable.billsum1);

return true;

}

public boolean onOptionsItemSelected(MenuItem item){

switch (item.getItemId()) {

case 1:

Toast.makeText(this, “menu1″,Toast.LENGTH_SHORT).show();

return true;

case 2:

return true;

case 3:

return true;

}

return false;

}

4.Activity 的切换

2个Activity 的切换,没有数据传递

//从A到B

Intent intent = new Intent();

intent.setClass(A.this, B.class);

startActivity(intent);

2个Activity 之间传递数据

相关的几个函数

startActivityForResult

public final void setResult(int resultCode, String data)

回调函数

protected void onActivityResult(int requestCode, int resultCode, Intent data)

例如A到B,从B得到数据

//A到B

static final int RG_REQUEST = 0;

Intent intent = new Intent();

intent.setClass(A.this, B.class);

startActivityForResult(intent,RG_REQUEST);

//在B中处理

Bundle bundle = new Bundle();

bundle.putString(“DataKey”, edittext.getText().toString());//给bundle 写入数据

Intent mIntent = new Intent();

mIntent.putExtras(bundle);

setResult(RESULT_OK, mIntent);

finish();

//最后在A的回调函数里面接收数据

if (requestCode == RG_REQUEST) {

if (resultCode == RESULT_CANCELED)

setTitle(“Canceled…”);

else if(resultCode == RESULT_OK) {

setTitle((String)data.getCharSequenceExtra(“DataKey”));

}

}