我是Android Studio新手，在运行示例代码方面存在一些问题： activity_main.xml中
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.abdul.moqueet.currency.MainActivity">
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="5"
android:id="@+id/et"
android:layout_marginTop="33dp"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<Spinner
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/spin"
android:layout_alignTop="@+id/et"
android:layout_toRightOf="@+id/et"
android:layout_toEndOf="@+id/et"
android:layout_marginLeft="47dp"
android:layout_marginStart="47dp" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/convert"
android:id="@+id/btn"
android:layout_marginTop="33dp"
android:layout_below="@+id/spin"
android:layout_toRightOf="@+id/et"
android:layout_toEndOf="@+id/et" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="@string/usdtxt"
android:id="@+id/TextView1"
android:layout_marginTop="20dp"
android:layout_below="@+id/btn"
android:layout_alignLeft="@+id/spin"
android:layout_alignStart="@+id/spin"
android:layout_marginLeft="80dp"
android:layout_marginStart="80dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="@string/eurtxt"
android:id="@+id/TextView2"
android:layout_marginTop="20dp"
android:layout_below="@+id/TextView1"
android:layout_alignLeft="@+id/spin"
android:layout_alignStart="@+id/spin"
android:layout_marginLeft="80dp"
android:layout_marginStart="80dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="@string/inrtxt"
android:id="@+id/TextView3"
android:layout_marginTop="20dp"
android:layout_below="@+id/TextView2"
android:layout_alignLeft="@+id/spin"
android:layout_alignStart="@+id/spin"
android:layout_marginLeft="80dp"
android:layout_marginStart="80dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="@string/zero"
android:id="@+id/usd"
android:layout_alignTop="@+id/TextView1"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginLeft="17dp"
android:layout_marginStart="17dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="@string/zero"
android:id="@+id/euro"
android:layout_above="@+id/TextView3"
android:layout_alignLeft="@+id/usd"
android:layout_alignStart="@+id/usd" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="@string/zero"
android:id="@+id/inr"
android:layout_alignTop="@+id/TextView3"
android:layout_alignLeft="@+id/euro"
android:layout_alignStart="@+id/euro" />
</RelativeLayout>
MainActivity.java
package com.example.adriangranosik.coinconverter;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class MainActivity extends AppCompatActivity {
private EditText et;
private TextView usd, euro, inr;
private Button btn;
private Spinner spin;
private int index = 0;
private double inputvalue;
private String result[] = new String[10];
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
et = (EditText) findViewById(R.id.et);
usd = (TextView) findViewById(R.id.usd);
euro = (TextView) findViewById(R.id.euro);
inr = (TextView) findViewById(R.id.inr);
btn = (Button) findViewById(R.id.btn);
spin = (Spinner) findViewById(R.id.spin);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.currency, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.select_dialog_singlechoice);
spin.setAdapter(adapter);
spin.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
index = position;
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
usd.setText("wait...");
euro.setText("wait...");
inr.setText("wait...");
if (et.getText().toString().trim().length() > 0 && !et.getText().toString().trim().equals(".")) {
String textValue = et.getText().toString();
inputvalue = Double.parseDouble(textValue);
new calculate().execute();
}
}
});
}
public class calculate extends AsyncTask<String, String, String[]> {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected String[] doInBackground(String... params) {
if (index == 0) {
String uRl;
try {
uRl = getJson("http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20yahoo.finance.xchange%20where%20pair%20in%20(%22USDEUR,USDINR%22)&format=json&env=store://datatables.org/alltableswithkeys");
JSONObject USDtojObj;
USDtojObj = new JSONObject(uRl);
JSONArray rateArray = USDtojObj.getJSONObject("query").getJSONObject("results").getJSONArray("rate");
result[0] = rateArray.getJSONObject(0).getString("Rate");
result[1] = rateArray.getJSONObject(1).getString("Rate");
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
} else if (index == 1) {
String uRl;
try {
uRl = getJson("http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20yahoo.finance.xchange%20where%20pair%20in%20(%22EURUSD,EURINR%22)&format=json&env=store://datatables.org/alltableswithkeys");
JSONObject EurotojObj;
EurotojObj = new JSONObject(uRl);
JSONArray rateArray = EurotojObj.getJSONObject("query").getJSONObject("results").getJSONArray("rate");
result[0] = rateArray.getJSONObject(0).getString("Rate");
result[1] = rateArray.getJSONObject(1).getString("Rate");
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
} else if (index == 2) {
String uRl;
try {
uRl = getJson("http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20yahoo.finance.xchange%20where%20pair%20in%20(%22INRUSD,INREUR%22)&format=json&env=store://datatables.org/alltableswithkeys");
JSONObject INRtojObj;
INRtojObj = new JSONObject(uRl);
JSONArray rateArray = INRtojObj.getJSONObject("query").getJSONObject("results").getJSONArray("rate");
result[0] = rateArray.getJSONObject(0).getString("Rate");
result[1] = rateArray.getJSONObject(1).getString("Rate");
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
}
return result;
}
@Override
protected void onPostExecute(String[] strings) {
if(index == 0){
double usdtoeuroval, usdtoinrval, usdtoeuroinp, usdtoinrinp, usdtousdinp;
usdtousdinp = inputvalue * 1;
usd.setText(""+usdtousdinp);
usdtoeuroval = Double.parseDouble(result[0]);
usdtoeuroinp = inputvalue * usdtoeuroval;
euro.setText(""+usdtoeuroinp);
usdtoinrval = Double.parseDouble(result[1]);
usdtoinrinp = inputvalue * usdtoinrval;
inr.setText(""+usdtoinrinp);
}else if(index == 1){
double eurotousdval, eurotoinrval, eurotousdinp, eurotoinrinp, eurotoeuroinp;
eurotoeuroinp = inputvalue * 1;
euro.setText(""+eurotoeuroinp);
eurotousdval = Double.parseDouble(result[0]);
eurotousdinp = inputvalue * eurotousdval;
usd.setText(""+eurotousdinp);
eurotoinrval = Double.parseDouble(result[1]);
eurotoinrinp = inputvalue * eurotoinrval;
inr.setText(""+eurotoinrinp);
}else if(index == 2){
double inrtousdval, inrtoeuroval, inrtousdinp, inrtoeuroinp, inrtoinrinp;
inrtoinrinp = inputvalue * 1;
inr.setText(""+inrtoinrinp);
inrtousdval = Double.parseDouble(result[0]);
inrtousdinp = inputvalue * inrtousdval;
usd.setText(""+inrtousdinp);
inrtoeuroval = Double.parseDouble(result[1]);
inrtoeuroinp = inputvalue * inrtoeuroval;
euro.setText(""+inrtoeuroinp);
}
}
public String getJson(String url) throws ClientProtocolException, IOException {
StringBuilder build = new StringBuilder();
HttpClient client = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url);
HttpResponse response = client.execute(httpGet);
HttpEntity entity = response.getEntity();
InputStream content = entity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(content));
String con;
while ((con = reader.readLine()) != null) {
build.append(con);
}
return build.toString();
}
}
}
我遇到错误：
布局/ activity_main.xml中
错误：找不到资源维度/ activity_vertical_margin（又名com.example.adriangranosik.coinconverter：dimen / activity_vertical_margin）。 错误：找不到资源维度/ activity_horizontal_margin（又名com.example.adriangranosik.coinconverter：dimen / activity_horizontal_margin）。 错误：找不到资源字符串/转换（也就是com.example.adriangranosik.coinconverter：string / convert）。 错误：找不到资源字符串/ usdtxt（又名com.example.adriangranosik.coinconverter：string / usdtxt）。
错误：找不到资源字符串/ eurtxt（又名com.example.adriangranosik.coinconverter：string / eurtxt）。
错误：找不到资源字符串/ inrtxt（又名com.example.adriangranosik.coinconverter：string / inrtxt）。
错误：找不到资源字符串/零（也就是com.example.adriangranosik.coinconverter：string / zero）。
错误：找不到资源字符串/零（也就是com.example.adriangranosik.coinconverter：string / zero）。
错误：找不到资源字符串/零（也就是com.example.adriangranosik.coinconverter：string / zero）。
空
链接文件资源失败。
我只是想运行一个程序来分析源代码。我知道有dimens.xml文件丢失，但我不知道该放什么。
我是Android开发人员的新手，所以我找到了示例代码，只是为了学习如何创建这样的应用程序。但是当我无法运行它时很难：D
感谢您的帮助。
答案 0 :(得分：1)
您可以直接替换
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
与smth一样
android:paddingBottom="8dp"
android:paddingLeft="8dp"
android:paddingRight="8dp"
android:paddingTop="8dp"
（或者如果所有4个填充相等，则可以只设置android:padding="8dp"）
答案 1 :(得分：0)
在res - ＆gt;值将此代码放在dimens.xml
中<dimen name="activity_vertical_margin">3dp</dimen>
根据您的用户界面调整dp。
答案 2 :(得分：0)
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
将以上代码替换为RelativeLayout中的以下行：
android:paddingBottom="16dp"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:paddingTop="16dp"