android startActivtyForResult以及ExpandableListActivity的使用
2015-01-23 15:19
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该程序实现 介绍如何启动Activity并获取被启动Activity返回的结果
1.MainActivity.java
3.效果
1.MainActivity.java
public class ActivityForResult extends Activity { Button bn; EditText city; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //获取界面上的组件 bn = (Button)findViewById(R.id.bn); city = (EditText)findViewById(R.id.city); //为按钮绑定事件监听器 bn.setOnClickListener(new OnClickListener() { @Override public void onClick(View source) { //创建需要对应于目标Activity的Intent Intent intent = new Intent(ActivityForResult.this , SelectCityActivity.class); //启动指定Activity并等待返回的结果,其中0是请求码,用于标识该请求 startActivityForResult(intent , 0); } }); } //重写该方法,该方法以回调的方式来获取指定Activity返回的结果 @Override public void onActivityResult(int requestCode , int resultCode , Intent intent) { //当requestCode、resultCode同时为0,也就是处理特定的结果 if (requestCode == 0 && resultCode == 0) { //取出Intent里的Extras数据 Bundle data = intent.getExtras(); //取出Bundle中的数据 String resultCity = data.getString("city"); //修改city文本框的内容 city.setText(resultCity); } } }2.SelectCityActivity.java
public class SelectCityActivity extends ExpandableListActivity { //定义省份数组 private String[] provinces = new String[] { "广东", "广西", "湖南"}; private String[][] cities = new String[][] { { "广州", "深圳", "珠海", "中山" }, { "桂林", "柳州", "南宁", "北海" }, { "长沙", "岳阳" , "衡阳" , "株洲" } }; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); ExpandableListAdapter adapter = new BaseExpandableListAdapter() { //获取指定组位置、指定子列表项处的子列表项数据 @Override public Object getChild(int groupPosition, int childPosition) { return cities[groupPosition][childPosition]; } @Override public long getChildId(int groupPosition, int childPosition) { return childPosition; } @Override public int getChildrenCount(int groupPosition) { return cities[groupPosition].length; } private TextView getTextView() { AbsListView.LayoutParams lp = new AbsListView.LayoutParams( ViewGroup.LayoutParams.FILL_PARENT, 64); TextView textView = new TextView(SelectCityActivity.this); textView.setLayoutParams(lp); textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT); textView.setPadding(36, 0, 0, 0); textView.setTextSize(20); return textView; } //该方法决定每个子选项的外观 @Override public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { TextView textView = getTextView(); textView.setText(getChild(groupPosition, childPosition).toString()); return textView; } //获取指定组位置处的组数据 @Override public Object getGroup(int groupPosition) { return provinces[groupPosition]; } @Override public int getGroupCount() { return provinces.length; } @Override public long getGroupId(int groupPosition) { return groupPosition; } //该方法决定每个组选项的外观 @Override public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { LinearLayout ll = new LinearLayout(SelectCityActivity.this); ll.setOrientation(0); ImageView logo = new ImageView(SelectCityActivity.this); ll.addView(logo); TextView textView = getTextView(); textView.setText(getGroup(groupPosition).toString()); ll.addView(textView); return ll; } @Override public boolean isChildSelectable(int groupPosition, int childPosition) { return true; } @Override public boolean hasStableIds() { return true; } }; // 设置该窗口显示列表 setListAdapter(adapter); getExpandableListView().setOnChildClickListener( new OnChildClickListener() { @Override public boolean onChildClick(ExpandableListView parent, View source, int groupPosition, int childPosition, long id) { //获取启动该Activity之前的Activity对应的Intent Intent intent = getIntent(); Bundle data = new Bundle(); data.putString("city" ,cities[groupPosition][childPosition]); intent.putExtras(data); // 设置该SelectActivity的结果码,并设置结束之后退回的Activity SelectCityActivity.this.setResult(0 , intent); //结束SelectCityActivity。 SelectCityActivity.this.finish(); return false; } }); } }
3.效果
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