Android 监听缩放和滑动事件

public static String getJson(String fileName, Context context) {
//将json数据变成字符串
StringBuilder stringBuilder = new StringBuilder();
try {
//获取assets资源管理器
AssetManager assetManager = context.getAssets();
//通过管理器打开文件并读取
BufferedReader bf = new BufferedReader(new InputStreamReader(
assetManager.open(fileName)));
String line;
while ((line = bf.readLine()) != null) {
stringBuilder.append(line);
}
} catch (IOException e) {
e.printStackTrace();
}
return stringBuilder.toString();
}