我正在使用achartengine在新活动中向我展示饼图。同样在主布局中我有两个Buttons。一个用于图表，另一个用于规则。
按下图表时，它通常会打开新活动，但每当我尝试按下规则时，应用程序都会停止工作。
public class MyActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button button =(Button)findViewById(R.id.rules);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent myIntent=new Intent(MyActivity.this,Rules.class);
startActivity(myIntent);
}
});
// Getting reference to the button btn_chart
Button btnChart = (Button) findViewById(R.id.btn_chart);
// Defining click event listener for the button btn_chart
OnClickListener clickListener = new OnClickListener() {
@Override
public void onClick(View v) {
openChart();
}
};
// Setting event click listener for the button btn_chart of the MainActivity layout
btnChart.setOnClickListener(clickListener);
}
private void openChart(){
// Pie Chart Section Names
String[] code = new String[] {
"Times played", "Gave up!", "Chicken"
};
// Pie Chart Section Value, ode bi samo iz baze pokupia tri broja i to bi bilo to
double[] distribution = { 82, 35, 56 } ;
// Color of each Pie Chart Sections
int[] colors = { Color.BLUE, Color.MAGENTA, Color.CYAN, Color.RED
};
// Instantiating CategorySeries to plot Pie Chart
CategorySeries distributionSeries = new CategorySeries(" Statistics");
for(int i=0 ;i < distribution.length;i++){
// Adding a slice with its values and name to the Pie Chart
distributionSeries.add(code[i], distribution[i]);
}
// Instantiating a renderer for the Pie Chart
DefaultRenderer defaultRenderer = new DefaultRenderer();
for(int i = 0 ;i<distribution.length;i++){
SimpleSeriesRenderer seriesRenderer = new SimpleSeriesRenderer();
seriesRenderer.setColor(colors[i]);
seriesRenderer.setDisplayChartValues(true);
// Adding a renderer for a slice
defaultRenderer.addSeriesRenderer(seriesRenderer);
}
defaultRenderer.setChartTitle("Statistics! ");
defaultRenderer.setChartTitleTextSize(25);
defaultRenderer.setZoomButtonsVisible(true);
defaultRenderer.setLabelsTextSize(25);
defaultRenderer.setLegendTextSize(20);
defaultRenderer.setBackgroundColor(Color.argb(255, 254,255, 59));
// Creating an intent to plot bar chart using dataset and multipleRenderer
Intent intent = ChartFactory.getPieChartIntent(getBaseContext(), distributionSeries , defaultRenderer, "Statistics");
// Start Activity
startActivity(intent);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
这是我的主要布局
<?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:background="#fffeff3b">
<Button
android:id="@+id/btn_chart"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true" android:text="Pie chart"/>
<Button
android:id="@+id/rules"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/btn_chart"
android:layout_marginTop="28dp"
android:text="Rules"
android:layout_alignRight="@+id/btn_chart"
android:layout_alignLeft="@+id/btn_chart"/>
</RelativeLayout>
我为图表添加了android清单活动。我知道如果删除该活动，那么应用程序将停止工作，我想这就是问题所在，同时也为类规则设置活动只有两个TextViews但是当按下按钮规则时它仍然存在应用程序崩溃。
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="in.wptrafficanalyzer.achartenginepiechart">
<uses-sdk
android:minSdkVersion="4"
android:targetSdkVersion="15" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.pie3.MyActivity"
android:label="@string/title_activity_main" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="org.achartengine.GraphicalActivity" />
<activity android:name="Rules"/>
</application>
</manifest>
所以，如果有人能帮助我，我将不胜感激。我读到了活动生命周期，但仍然无法得到答案。我是android编程的新手，很抱歉，如果它很简单..谢谢
logcat的：
12-19 17:20:14.441 921-921/in.wptrafficanalyzer.achartenginepiechart D/libEGL﹕ loaded /system/lib/egl/libEGL_genymotion.so
12-19 17:20:14.441 921-921/in.wptrafficanalyzer.achartenginepiechart D/﹕ HostConnection::get() New Host Connection established 0xb9582510, tid 921
12-19 17:20:14.457 921-921/in.wptrafficanalyzer.achartenginepiechart D/libEGL﹕ loaded /system/lib/egl/libGLESv1_CM_genymotion.so
12-19 17:20:14.457 921-921/in.wptrafficanalyzer.achartenginepiechart D/libEGL﹕ loaded /system/lib/egl/libGLESv2_genymotion.so
12-19 17:20:14.509 921-921/in.wptrafficanalyzer.achartenginepiechart W/EGL_genymotion﹕ eglSurfaceAttrib not implemented
12-19 17:20:14.509 921-921/in.wptrafficanalyzer.achartenginepiechart E/OpenGLRenderer﹕ Getting MAX_TEXTURE_SIZE from GradienCache
12-19 17:20:14.509 921-921/in.wptrafficanalyzer.achartenginepiechart E/OpenGLRenderer﹕ MAX_TEXTURE_SIZE: 16384
12-19 17:20:14.517 921-921/in.wptrafficanalyzer.achartenginepiechart E/OpenGLRenderer﹕ Getting MAX_TEXTURE_SIZE from Caches::initConstraints()
12-19 17:20:14.517 921-921/in.wptrafficanalyzer.achartenginepiechart E/OpenGLRenderer﹕ MAX_TEXTURE_SIZE: 16384
12-19 17:20:14.517 921-921/in.wptrafficanalyzer.achartenginepiechart D/OpenGLRenderer﹕ Enabling debug mode 0
12-19 17:20:19.665 921-921/in.wptrafficanalyzer.achartenginepiechart D/AndroidRuntime﹕ Shutting down VM
12-19 17:20:19.665 921-921/in.wptrafficanalyzer.achartenginepiechart W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0xa4cabb20)
12-19 17:20:19.669 921-921/in.wptrafficanalyzer.achartenginepiechart E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: in.wptrafficanalyzer.achartenginepiechart, PID: 921
android.content.ActivityNotFoundException: Unable to find explicit activity class {in.wptrafficanalyzer.achartenginepiechart/com.example.pie3.Rules}; have you declared this activity in your AndroidManifest.xml?
at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1628)
at android.app.Instrumentation.execStartActivity(Instrumentation.java:1424)
at android.app.Activity.startActivityForResult(Activity.java:3424)
at android.app.Activity.startActivityForResult(Activity.java:3385)
at android.app.Activity.startActivity(Activity.java:3627)
at android.app.Activity.startActivity(Activity.java:3595)
at com.example.pie3.MyActivity$1.onClick(MyActivity.java:30)
at android.view.View.performClick(View.java:4438)
at android.view.View$PerformClick.run(View.java:18422)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
我也尝试在android清单中命名活动： logcat然后看起来像这样：
12-19 17:46:36.213 1942-1942/in.wptrafficanalyzer.achartenginepiechart D/libEGL﹕ loaded /system/lib/egl/libEGL_genymotion.so
12-19 17:46:36.217 1942-1942/in.wptrafficanalyzer.achartenginepiechart D/﹕ HostConnection::get() New Host Connection established 0xb957b1c0, tid 1942
12-19 17:46:36.229 1942-1942/in.wptrafficanalyzer.achartenginepiechart D/libEGL﹕ loaded /system/lib/egl/libGLESv1_CM_genymotion.so
12-19 17:46:36.233 1942-1942/in.wptrafficanalyzer.achartenginepiechart D/libEGL﹕ loaded /system/lib/egl/libGLESv2_genymotion.so
12-19 17:46:36.293 1942-1942/in.wptrafficanalyzer.achartenginepiechart W/EGL_genymotion﹕ eglSurfaceAttrib not implemented
12-19 17:46:36.293 1942-1942/in.wptrafficanalyzer.achartenginepiechart E/OpenGLRenderer﹕ Getting MAX_TEXTURE_SIZE from GradienCache
12-19 17:46:36.293 1942-1942/in.wptrafficanalyzer.achartenginepiechart E/OpenGLRenderer﹕ MAX_TEXTURE_SIZE: 16384
12-19 17:46:36.305 1942-1942/in.wptrafficanalyzer.achartenginepiechart E/OpenGLRenderer﹕ Getting MAX_TEXTURE_SIZE from Caches::initConstraints()
12-19 17:46:36.305 1942-1942/in.wptrafficanalyzer.achartenginepiechart E/OpenGLRenderer﹕ MAX_TEXTURE_SIZE: 16384
12-19 17:46:36.305 1942-1942/in.wptrafficanalyzer.achartenginepiechart D/OpenGLRenderer﹕ Enabling debug mode 0
12-19 17:46:43.489 1942-1942/in.wptrafficanalyzer.achartenginepiechart D/dalvikvm﹕ GC_FOR_ALLOC freed 81K, 4% free 3299K/3436K, paused 1ms, total 2ms
12-19 17:46:43.489 1942-1942/in.wptrafficanalyzer.achartenginepiechart I/dalvikvm-heap﹕ Grow heap (frag case) to 4.345MB for 1127532-byte allocation
12-19 17:46:43.493 1942-1951/in.wptrafficanalyzer.achartenginepiechart D/dalvikvm﹕ GC_FOR_ALLOC freed 1K, 4% free 4398K/4540K, paused 4ms, total 4ms
12-19 17:46:43.505 1942-1942/in.wptrafficanalyzer.achartenginepiechart D/AndroidRuntime﹕ Shutting down VM
12-19 17:46:43.505 1942-1942/in.wptrafficanalyzer.achartenginepiechart W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0xa4cabb20)
12-19 17:46:43.505 1942-1942/in.wptrafficanalyzer.achartenginepiechart E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: in.wptrafficanalyzer.achartenginepiechart, PID: 1942
java.lang.RuntimeException: Unable to start activity ComponentInfo{in.wptrafficanalyzer.achartenginepiechart/com.example.pie3.Rules}: java.lang.RuntimeException: native typeface cannot be made
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
at android.app.ActivityThread.access$800(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.RuntimeException: native typeface cannot be made
at android.graphics.Typeface.<init>(Typeface.java:175)
at android.graphics.Typeface.createFromAsset(Typeface.java:149)
at com.example.pie3.Rules.onCreate(Rules.java:17)
at android.app.Activity.performCreate(Activity.java:5231)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
at android.app.ActivityThread.access$800(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：0)
您是否在AndroidManifest.xml中将此活动声明为com.example.pie3.Rules？
答案 1 :(得分：0)
就像我说的，我的问题是自定义字体：当我从我的班级和所有布局中删除它时。应用程序工作正常。因此，如果在LOGCAT中有任何人有问题：RuntimeException：无法生成本机字体!!只需删除自定义字体。希望能帮助其他有同样问题的人。干杯