聚合天气预报
1.使用 http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json 新浪 IP API 进行城市定位。
2.添加 ProgressDialog ，获取数据时显示“请稍后”。报错：java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
UI组件不能写在进程中，要写在handle中，通过进程发消息控制其显隐。
3.TextView添加点击刷新：
设置TextView的XML的属性 android:onClick="click"，
代码中写：
public void click(View v) {
Toast.makeText(getApplicationContext(), "刷新", Toast.LENGTH_LONG).show();
new Thread(t).start();
}
点击没反应？布局XML文件中要设置TextView的clickable属性值为true, 或者对TextView实例调用setClickable方法，参数设为true。
已知问题：刷新后界面乱了：
import java.io.UnsupportedEncodingException;
import java.util.Calendar;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
int iweather[];
String city, url, jsons, tempnow, scity, supdatetime, stempnow, sweather1,
stemp1, swind1, shumidity, stoday, sdate[], sweek[], sweather[],
stemp[], swind[];
JSONObject jsono, info;
private final Handler handler = new Handler();
ProgressDialog PD;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new Thread(t).start();
}
final Runnable mUpdateResults = new Runnable() {
@Override
public void run() {
TextView tvcity = (TextView) findViewById(R.id.city);
tvcity.setText(scity);
TextView updatetime = (TextView) findViewById(R.id.updatetime);
updatetime.setText(supdatetime);
TextView tempnow = (TextView) findViewById(R.id.tempnow);
tempnow.setText(stempnow);
TextView weather0 = (TextView) findViewById(R.id.weather);
weather0.setText(sweather[0]);
ImageView bg = (ImageView) findViewById(R.id.bg);
bg.setImageDrawable(MainActivity.this.getResources().getDrawable(
getBgImage(sweather[0])));
TextView temp0 = (TextView) findViewById(R.id.temp);
temp0.setText(stemp[0]);
TextView wind0 = (TextView) findViewById(R.id.wind);
wind0.setText(swind[0]);
TextView humidity = (TextView) findViewById(R.id.humidity);
humidity.setText(shumidity);
TextView today = (TextView) findViewById(R.id.today);
today.setText(stoday);
LinearLayout future = (LinearLayout) findViewById(R.id.future);
for (int i = 1; i < 7; i++) {
LinearLayout f = new LinearLayout(MainActivity.this);
f.setOrientation(LinearLayout.VERTICAL);
f.setGravity(Gravity.CENTER);
int p = 0;
f.setPadding(p, p, p, p);
future.addView(f, new LinearLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
TextView date = new TextView(MainActivity.this);
date.setText(sdate[i]);
f.addView(date);
date.setGravity(Gravity.CENTER);
TextView week = new TextView(MainActivity.this);
week.setText(sweek[i]);
f.addView(week);
week.setGravity(Gravity.CENTER);
ImageView wi = new ImageView(MainActivity.this);
wi.setImageDrawable(MainActivity.this.getResources()
.getDrawable(iweather[i]));
f.addView(wi);
LayoutParams params = wi.getLayoutParams();
params.width = 90;
params.height = 90;
wi.setLayoutParams(params);
TextView weather = new TextView(MainActivity.this);
weather.setText(sweather[i]);
f.addView(weather);
weather.setGravity(Gravity.CENTER);
TextView temp = new TextView(MainActivity.this);
temp.setText(stemp[i]);
// temp.setLayoutParams(new LayoutParams(
// LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
temp.setGravity(Gravity.CENTER);
f.addView(temp);
TextView wind = new TextView(MainActivity.this);
wind.setText(swind[i]);
// wind.setLayoutParams(new LayoutParams(
// LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
wind.setGravity(Gravity.CENTER);
f.addView(wind);
}
PDD.sendEmptyMessage(0);
}
};
Thread t = new Thread() {
@Override
public void run() {
PDS.sendEmptyMessage(0);
url = "http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json";
jsons = HttpUtils.getURLResponse(url);
try {
jsono = new JSONObject(jsons);
city = jsono.getString("city");
} catch (JSONException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
city = java.net.URLEncoder.encode(city, "UTF-8");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
url = "http://v.juhe.cn/weather/index?cityname=" + city
+ "&key=e73ad3113b4e8dc2b7e8d8298a40d8e3";
jsons = HttpUtils.getURLResponse(url);
try {
jsono = new JSONObject(jsons);
JSONObject sk = jsono.getJSONObject("result").getJSONObject(
"sk");
scity = jsono.getJSONObject("result").getJSONObject("today")
.getString("city");
supdatetime = sk.getString("time") + "更新";
stempnow = sk.getString("temp") + "℃";
shumidity = sk.getString("humidity");
stoday = jsono.getJSONObject("result").getJSONObject("today")
.getString("date_y")
+ " "
+ jsono.getJSONObject("result").getJSONObject("today")
.getString("week");
Calendar c = Calendar.getInstance();
String day[] = new String[7];
sdate = new String[7];
sweek = new String[7];
iweather = new int[7];
sweather = new String[7];
stemp = new String[7];
swind = new String[7];
for (int i = 0; i < 7; i++) {
int y = c.get(Calendar.YEAR);
int m = c.get(Calendar.MONTH) + 1;
int d = c.get(Calendar.DAY_OF_MONTH);
day[i] = new String("day_" + y + m1(m) + d1(d));
JSONObject day_ = jsono.getJSONObject("result")
.getJSONObject("future").getJSONObject(day[i]);
sdate[i] = day_.getString("date").substring(4, 8);
sweek[i] = day_.getString("week");
iweather[i] = getWeatherImage(day_.getString("weather"));
sweather[i] = day_.getString("weather");
stemp[i] = day_.getString("temperature");
swind[i] = day_.getString("wind");
c.add(Calendar.DAY_OF_MONTH, 1);
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
handler.post(mUpdateResults);
}
};
@Override
public boolean onCreateOptionsMenu(Menu menu) {
menu.add(0, 0, 0, "退出");
menu.add(0, 1, 1, "关于");
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int item_id = item.getItemId();
switch (item_id) {
case 0:
MainActivity.this.finish();
break;
case 1:
new AlertDialog.Builder(this)
.setIcon(R.drawable.ic_launcher)
.setTitle("聚合天气 V3.0")
.setMessage(
"聚合天气API预报，\n桌面动态图标，\n图形天气预报界面。\n作者：黄颖\nQQ：84429027")
.setPositiveButton("确定", null).show();
break;
}
return true;
}
String m1(int i) {
return i < 10 ? "0" + i : "" + i;
}
String d1(int i) {
return i < 10 ? "0" + i : "" + i;
}
private int getWeatherImage(String weather) {
if (weather.indexOf("晴") != -1)
return R.drawable.qing;
if (weather.indexOf("阴") != -1)
return R.drawable.yin;
if (weather.indexOf("多云") != -1)
return R.drawable.duoyun;
if (weather.indexOf("阵雨") != -1)
return R.drawable.zhenyu;
if (weather.indexOf("中雨") != -1)
return R.drawable.zhongyu;
return R.drawable.ic_launcher;
}
private int getBgImage(String weather) {
if (weather.indexOf("晴") != -1)
return R.drawable.bgqing;
if (weather.indexOf("阴") != -1)
return R.drawable.bgyin;
if (weather.indexOf("多云") != -1)
return R.drawable.bgduoyun;
if (weather.indexOf("雨") != -1)
return R.drawable.bgrain;
if (weather.indexOf("雪") != -1)
return R.drawable.bgsnow;
return R.drawable.ic_launcher;
}
public void click(View v) {
Toast.makeText(getApplicationContext(), "刷新", Toast.LENGTH_LONG).show();
new Thread(t).start();
}
private final Handler PDD = new Handler() {
@Override
public void handleMessage(Message msg) {
PD.dismiss();
}
};
private final Handler PDS = new Handler() {
@Override
public void handleMessage(Message msg) {
PD = ProgressDialog.show(MainActivity.this, null, "加载数据中，请稍等");
}
};
}