动态定义toast

最新推荐文章于 2022-05-01 00:00:00 发布

原创最新推荐文章于 2022-05-01 00:00:00 发布 · 494 阅读

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文章标签：

#string #layout #iterator #json #hashmap #exception

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下面分别采用两种方式创建Toast(转:http://zhoujianghai.iteye.com/blog/814940)

/**
 *自定义美化Toast，使用图片作背景
 */
    private void showToast() {
    	Toast t = new Toast(this);
	t.setDuration(Toast.LENGTH_SHORT);
	LinearLayout layout = new LinearLayout(this);
	layout.setBackgroundResource(R.drawable.toast_bg);
	TextView textView = new TextView(this);
	textView.setText("javaeye：您好！");
	textView.setTextSize(14);
	textView.setTextColor(Color.WHITE);
	layout.addView(textView);
	t.setView(layout);
	t.setGravity(Gravity.TOP, 100+20, 200 + 20);
	t.show();
    }
 
    /**
     * 默认的Toast效果
     */
    private void showToast2() {
    	Toast t = Toast.makeText(this, "csdn：您好！", Toast.LENGTH_SHORT);
	t.setGravity(Gravity.TOP, 100+20, 200 + 20);
	t.show();
    }

===================

通过json动态创建 toast

如下所示：

可以通过testCreateJsonObj()创建测试json，也可以直接通过json字符串创建。

Toast toast = Toast.makeText(MainActivity.this, "", Toast.LENGTH_LONG);
//View textView = toast.getView();

LinearLayout lay = new LinearLayout(MainActivity.this);
lay.setBackgroundResource(R.drawable.toast_bg);  
lay.setOrientation(LinearLayout.VERTICAL);
//add img
ImageView view = new ImageView(MainActivity.this);
view.setImageResource(R.drawable.ic_launcher);
lay.addView(view);
 				
//JSONObject data = testCreateJsonObj();
JSONObject data = null;
try {
	data = new JSONObject("{\"array\":[{\"color\":\"#ffff0000\",\"text\":\"andytest1\",\"size\":\"24\",\"gravity\":\"center\"},{\"color\":\"#ff0000ff\",\"text\":\"andytest2\n换行测试\",\"size\":\"14\",\"gravity\":\"left\"}],\"layout\":{\"gravity\":\"center\"}}");
} catch (JSONException e1) {
	e1.printStackTrace();
}
Log.e("andy_show_json:", data.toString());
int pos = Gravity.CENTER;
try {
	pos = str2pos(data.getJSONObject("layout").getString("gravity"));

	JSONArray array = data.getJSONArray("array");
	for (int i = 0; i < array.length(); i++) {
		JSONObject iObj = array.getJSONObject(i);
		addTextView(lay, iObj);
	}
} catch (JSONException e) {// 抛错 说明JSON字符不是数组或根本就不是JSON
	e.printStackTrace();
}

toast.setGravity(pos, 0, 0);
toast.setView(lay);
toast.show();

相关函数:

public JSONObject createJsonObject(HashMap<String, String> hashMap) {
	JSONObject jsonobj = new JSONObject();
	Set<String> keys = hashMap.keySet();
	try {
		for (Iterator<String> iterator = keys.iterator(); iterator
				.hasNext();) {
			String key = iterator.next();
			jsonobj.put(key, hashMap.get(key));
		}
	} catch (JSONException e) {
		e.printStackTrace();
	}
	return jsonobj;
}

public JSONArray createJsonArray(ArrayList<HashMap<String, String>> mylist) {
	JSONArray array = new JSONArray();
	for (Iterator<HashMap<String, String>> iterator = mylist.iterator(); iterator
			.hasNext();) {
		JSONObject jsonobj = createJsonObject(iterator.next());
		array.put(jsonobj);
	}
	return array;
}

public JSONObject testCreateJsonObj(){
	JSONObject jsonobj=new JSONObject();
	try {
		ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>();
		HashMap<String, String> map = new HashMap<String, String>();
		map.put("text", "andytest1");
		map.put("size", "24");
		map.put("color", "#ffff0000");
		map.put("gravity", "center");
		mylist.add(map);
		
		map = new HashMap<String, String>();
		map.put("text", "andytest2\n换行测试");
		map.put("size", "14");
		map.put("color", "#ff0000ff");
		map.put("gravity", "left");
		mylist.add(map);
		
		map = new HashMap<String, String>();
		map.put("gravity", "center");
		jsonobj.put("layout", createJsonObject(map));
		jsonobj.put("array", createJsonArray(mylist));
	} catch (JSONException e) {
		e.printStackTrace();
	}
	
	
	return jsonobj;
}
private int str2pos(String str) {
	int pos = Gravity.CENTER;
	if(str.equals("right")) {
		pos = Gravity.RIGHT;
	} else if(str.equals("left")){
		pos = Gravity.LEFT;
	} else {//center
		pos = Gravity.CENTER;
	}
	return pos;
}

private int color2int(String color) {
	// 服务器端下发color格式：#ffcc00cc 或 #ffcc00
	int value = 0xff000000;
	if (color != null && color.startsWith("#")
			&& (color.length() == 7 || color.length() == 9)) {
		try {
			value = Color.parseColor(color);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	return value;
}
private void addTextView(LinearLayout lay, JSONObject iObj) {
	TextView textView = new TextView(MainActivity.this);
	try {
		textView.setText((String)iObj.get("text"));
    	textView.setTextSize(Integer.valueOf((String)iObj.get("size")));  
        textView.setTextColor(color2int((String)iObj.get("color")));
        textView.setGravity(str2pos((String)iObj.get("gravity")));
	} catch (JSONException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}

	LinearLayout.LayoutParams p = new LinearLayout.LayoutParams(
			LinearLayout.LayoutParams.FILL_PARENT,
			LinearLayout.LayoutParams.WRAP_CONTENT);

	
	lay.addView(textView, p);
}