[英]Android app crashes upon startup
我是編程新手,一段時間后,我終於解決了所有錯誤,但現在該應用在啟動時崩潰! 我沒有自己編寫所有這些代碼,但已對其進行了編輯。 另外,當我仍然收到錯誤消息時,該應用程序可以啟動(但無法正常運行)。 表現
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="tk.iWeld.iweld"
android:versionCode="1"
android:versionName="1.0" >
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="22" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="tk.iWeld.iweld.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Activity_Main
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/RelativeLayout1"
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=".MainActivity" >
<EditText
android:id="@+id/editText2"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/editText2"
android:layout_alignBottom="@+id/editText2"
android:layout_alignParentRight="true"
android:layout_marginRight="20dp"
android:ems="10"
android:hint="Text2"
android:inputType="number" >
<requestFocus />
</EditText>
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/editText2"
android:layout_centerHorizontal="true"
android:text="X"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="@android:color/holo_orange_dark" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/editText2"
android:layout_centerHorizontal="true"
android:text="_________________________"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="@android:color/holo_orange_dark" />
<EditText
android:id="@+id/Text3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textView2"
android:layout_centerHorizontal="true"
android:ems="10"
android:hint="Text3"
android:inputType="number" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView1"
android:layout_below="@+id/Text3"
android:layout_marginTop="22dp"
android:text="="
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="@android:color/holo_orange_dark"
android:textColorHint="@android:color/holo_orange_dark"
android:textSize="30sp" />
<TextView
android:id="@+id/textRes"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/textView3"
android:layout_alignBottom="@+id/textView3"
android:layout_alignParentRight="true"
android:clickable="false"
android:longClickable="false"
android:text="Result"
android:textAppearance="?android:attr/textAppearanceMedium" />
<Button
android:id="@+id/resultbutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView2"
android:layout_alignTop="@+id/textView3"
android:text="Result" />
<EditText
android:id="@+id/editText1"
android:layout_width="89dp"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/textView1"
android:layout_alignLeft="@+id/textView2"
android:ems="10"
android:hint="Text1"
android:inputType="number" />
和MainActivity
package tk.iWeld.iweld;
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.menu.main);
}
public void calculateClickHandler(View view) {
// make sure we handle the click of the calculator button
if (view.getId() == R.id.resultbutton) {
// get the references to the widgets
EditText text1Text = (EditText)findViewById(R.id.editText1);
EditText text2Text = (EditText)findViewById(R.id.editText2);
EditText text3Text = (EditText)findViewById(R.id.Text3);
TextView resultText = (TextView)findViewById(R.id.textRes);
// get the users values from the widget references
float text1 = Float.parseFloat(text1Text.getText().toString());
float text2 = Float.parseFloat(text2Text.getText().toString());
float text3 = Float.parseFloat(text3Text.getText().toString());
// calculate the result value
float totalresult = calculateRESULT(text1, text2, text3);
// now set the value in the result text
resultText.setText("" + totalresult);
}
}
// the formula to calculate the result index
private float calculateRESULT (float text1, float text2, float text3) {
return (float) (text1 * text2 / text3);
}
}
在onCreate()的第二行中有一個錯誤:
setContentView(R.menu.main);
您不能將菜單設置為視圖。 如果要使用主布局,請使用以下命令:
setContentView(R.layout.main);
這個...
android:targetSdkVersion="22" />
是科幻小說!
今天的最大API級別是19
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.