android startActivityForResult 使用实例

ActivityForResult.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);
		}
	}
}

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.MATCH_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();
					intent.putExtra("city",
							cities[groupPosition][childPosition]);
					// 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;
				}
			});
	}
}

例子比较简单,点击 无需积分下载源码