我正在尝试学习构建 Android 应用程序。这是我的第一次尝试。一切都很好，当我开始这个活动时（这是有人会选择摇滚的时候），我可以让它显示 Hello World。我试图制定输赢规则，但每当我选择摇滚时，我的应用程序就会崩溃。请看一下。
package ro.pa.sc;
import java.util.Random;
import android.annotation.TargetApi;
import android.app.Activity;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.NavUtils;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
public class Rockvs extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
randombox();
setContentView(R.layout.activity_rockvs);
// Show the Up button in the action bar.
setupActionBar();
}
/**
* Set up the {@link android.app.ActionBar}, if the API is available.
*/
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
private void setupActionBar() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
getActionBar().setDisplayHomeAsUpEnabled(true);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.rockvs, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
// This ID represents the Home or Up button. In the case of this
// activity, the Up button is shown. Use NavUtils to allow users
// to navigate up one level in the application structure. For
// more details, see the Navigation pattern on Android Design:
//
// http://developer.android.com/design/patterns/navigation.html#up- vs-back
//
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}
public void randombox()
{
Random r = new Random();
int pickedNumber=r.nextInt(2);
if (pickedNumber==1) {
win();
} else if (pickedNumber==2) {
lose();
} else if (pickedNumber==0){
tie();
}
}
public void win() {
String message = "Computer picked Scissors! You Won!";
TextView textView = new TextView(this);
textView.setTextSize(40);
textView.setText(message);
setContentView(textView);
}
public void lose() {
String message = "Computer picked Paper! You Lose!";
TextView textView = new TextView(this);
textView.setTextSize(40);
textView.setText(message);
setContentView(textView);
}
public void tie() {
String message = "Computer picked Rock! It's a Tie!";
TextView textView = new TextView(this);
textView.setTextSize(40);
textView.setText(message);
setContentView(textView);
}
}
日志输出：
05-05 19:22:46.571: D/ActivityThread(15646): setTargetHeapUtilization:0.25
05-05 19:22:46.571: D/ActivityThread(15646): setTargetHeapIdealFree:8388608
05-05 19:22:46.581: D/ActivityThread(15646): setTargetHeapConcurrentStart:2097152
05-05 19:22:46.722: I/Adreno200-EGL(15646): <qeglDrvAPI_eglInitialize:269>: EGL 1.4 QUALCOMM build: (CL2803123)
05-05 19:22:46.722: I/Adreno200-EGL(15646): Build Date: 11/28/12 Wed
05-05 19:22:46.722: I/Adreno200-EGL(15646): Local Branch: D1L_JB_1736J_Disable_CPUMempool
05-05 19:22:46.722: I/Adreno200-EGL(15646): Remote Branch:
05-05 19:22:46.722: I/Adreno200-EGL(15646): Local Patches:
05-05 19:22:46.722: I/Adreno200-EGL(15646): Reconstruct Branch:
05-05 19:22:48.233: W/dalvikvm(15646): threadid=1: thread exiting with uncaught exception (group=0x4126c438)
05-05 19:22:48.253: E/AndroidRuntime(15646): FATAL EXCEPTION: main
05-05 19:22:48.253: E/AndroidRuntime(15646): java.lang.RuntimeException: Unable to start activity ComponentInfo{ro.pa.sc/ro.pa.sc.Rockvs}: android.view.InflateException: Binary XML file line #11: Error inflating class <unknown>
05-05 19:22:48.253: E/AndroidRuntime(15646): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2080)
05-05 19:22:48.253: E/AndroidRuntime(15646): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2105)
05-05 19:22:48.253: E/AndroidRuntime(15646): at android.app.ActivityThread.access$600(ActivityThread.java:137)
05-05 19:22:48.253: E/AndroidRuntime(15646): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1203)
05-05 19:22:48.253: E/AndroidRuntime(15646): at android.os.Handler.dispatchMessage(Handler.java:99)
05-05 19:22:48.253: E/AndroidRuntime(15646): at android.os.Looper.loop(Looper.java:137)
05-05 19:22:48.253: E/AndroidRuntime(15646): at android.app.ActivityThread.main(ActivityThread.java:4904)
05-05 19:22:48.253: E/AndroidRuntime(15646): at java.lang.reflect.Method.invokeNative(Native Method)
05-05 19:22:48.253: E/AndroidRuntime(15646): at java.lang.reflect.Method.invoke(Method.java:511)
05-05 19:22:48.253: E/AndroidRuntime(15646): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
05-05 19:22:48.253: E/AndroidRuntime(15646): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
05-05 19:22:48.253: E/AndroidRuntime(15646): at dalvik.system.NativeStart.main(Native Method)
05-05 19:22:48.253: E/AndroidRuntime(15646): Caused by: android.view.InflateException: Binary XML file line #11: Error inflating class <unknown>
05-05 19:22:48.253: E/AndroidRuntime(15646): at android.view.LayoutInflater.createView(LayoutInflater.java:613)
05-05 19:22:48.253: E/AndroidRuntime(15646): at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56)
05-05 19:22:48.253: E/AndroidRuntime(15646): at android.view.LayoutInflater.onCreateView(LayoutInflater.java:660)
05-05 19:22:48.253: E/AndroidRuntime(15646): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:685)
05-05 19:22:48.253: E/AndroidRuntime(15646): at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
05-05 19:22:48.253: E/AndroidRuntime(15646): at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
05-05 19:22:48.253: E/AndroidRuntime(15646): at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
05-05 19:22:48.253: E/AndroidRuntime(15646): at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
05-05 19:22:48.253: E/AndroidRuntime(15646): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:321)
05-05 19:22:48.253: E/AndroidRuntime(15646): at android.app.Activity.setContentView(Activity.java:2087)
05-05 19:22:48.253: E/AndroidRuntime(15646): at ro.pa.sc.Rockvs.onCreate(Rockvs.java:20)
05-05 19:22:48.253: E/AndroidRuntime(15646): at android.app.Activity.performCreate(Activity.java:5232)
05-05 19:22:48.253: E/AndroidRuntime(15646): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1082)
05-05 19:22:48.253: E/AndroidRuntime(15646): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2044)
05-05 19:22:48.253: E/AndroidRuntime(15646): ... 11 more
05-05 19:22:48.253: E/AndroidRuntime(15646): Caused by: java.lang.reflect.InvocationTargetException
05-05 19:22:48.253: E/AndroidRuntime(15646): at java.lang.reflect.Constructor.constructNative(Native Method)
05-05 19:22:48.253: E/AndroidRuntime(15646): at java.lang.reflect.Constructor.newInstance(Constructor.java:417)
05-05 19:22:48.253: E/AndroidRuntime(15646): at android.view.LayoutInflater.createView(LayoutInflater.java:587)
05-05 19:22:48.253: E/AndroidRuntime(15646): ... 24 more
05-05 19:22:48.253: E/AndroidRuntime(15646): Caused by: android.content.res.Resources$NotFoundException: File You picked Rock! I hope you win! from drawable resource ID #0x7f050009: .xml extension required
05-05 19:22:48.253: E/AndroidRuntime(15646): at android.content.res.Resources.loadColorStateList(Resources.java:2094)
05-05 19:22:48.253: E/AndroidRuntime(15646): at android.content.res.TypedArray.getColorStateList(TypedArray.java:342)
05-05 19:22:48.253: E/AndroidRuntime(15646): at android.widget.TextView.<init>(TextView.java:820)
05-05 19:22:48.253: E/AndroidRuntime(15646): at android.widget.TextView.<init>(TextView.java:489)
05-05 19:22:48.253: E/AndroidRuntime(15646): ... 27 more
XML 文件：
<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=".Rockvs" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:text="@string/pickedrock"
android:textColor="@string/pickedrock"
android:textSize="25sp" />
</RelativeLayout>