按照WebView文档，我想注入一个公共 java 函数webView并使用 JavasSript 调用它，当该函数的形式为
public String myfunc(){
//....
}
它可以工作，但是在使用throws关键字时会导致致命错误。
这是我的完整代码：
package com.arad.test1;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.webkit.WebSettings.PluginState;
import android.webkit.WebView;
import android.widget.Toast;
import com.arad.test1.model.test;
import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
public class Test1Activity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.test);
final WebView myWebView = (WebView) findViewById(R.id.webView1);
myWebView.getSettings().setJavaScriptEnabled(true);
myWebView.getSettings().setPluginState(PluginState.ON);
myWebView.addJavascriptInterface(this, "appConnector");
try {
myWebView.loadDataWithBaseURL(
"file:///android_asset/",
convertStreamToString(getAssets().open(
"templates/test.html")), "text/html", "utf-8", "");
} catch (IOException e) {
Log.e("Test1", e.getMessage());
}
}
public String load() {
return generateJsonFromClass();
}
private String generateJsonFromClass() {
try {
ObjectMapper mapper = new ObjectMapper();
test t = new test();
String result = mapper.writeValueAsString(t);
return result;
} catch (JsonGenerationException e) {
Log.e("Test1", e.getMessage());
return "JsonGenerationException";
} catch (JsonMappingException e) {
Log.e("Test1", e.getMessage());
return "JsonMappingException";
} catch (IOException e) {
Log.e("Test1", e.getMessage());
return "IOException";
}
}
private static String convertStreamToString(InputStream is) {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
}
这是 DDMS 日志：
07-10 10:02:42.183: E/dalvikvm(20521): Could not find class 'com.fasterxml.jackson.databind.ObjectMapper', referenced from method com.arad.test1.Test1Activity.generateJsonFromClass
07-10 10:02:42.183: W/dalvikvm(20521): VFY: unable to resolve new-instance 28 (Lcom/fasterxml/jackson/databind/ObjectMapper;) in Lcom/arad/test1/Test1Activity;
07-10 10:02:42.183: D/dalvikvm(20521): VFY: replacing opcode 0x22 at 0x0000
07-10 10:02:42.183: W/dalvikvm(20521): VFY: unable to resolve exception class 26 (Lcom/fasterxml/jackson/core/JsonGenerationException;)
07-10 10:02:42.183: W/dalvikvm(20521): VFY: unable to find exception handler at addr 0xf
07-10 10:02:42.183: W/dalvikvm(20521): VFY: rejected Lcom/arad/test1/Test1Activity;.generateJsonFromClass ()Ljava/lang/String;
07-10 10:02:42.183: W/dalvikvm(20521): VFY: rejecting opcode 0x0d at 0x000f
07-10 10:02:42.183: W/dalvikvm(20521): VFY: rejected Lcom/arad/test1/Test1Activity;.generateJsonFromClass ()Ljava/lang/String;
07-10 10:02:42.212: W/dalvikvm(20521): Verifier rejected class Lcom/arad/test1/Test1Activity;
07-10 10:02:42.212: W/dalvikvm(20521): Class init failed in newInstance call (Lcom/arad/test1/Test1Activity;)
07-10 10:02:42.223: D/AndroidRuntime(20521): Shutting down VM
07-10 10:02:42.223: W/dalvikvm(20521): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
07-10 10:02:42.322: E/AndroidRuntime(20521): FATAL EXCEPTION: main
07-10 10:02:42.322: E/AndroidRuntime(20521): java.lang.VerifyError: com/arad/test1/Test1Activity
07-10 10:02:42.322: E/AndroidRuntime(20521): at java.lang.Class.newInstanceImpl(Native Method)
07-10 10:02:42.322: E/AndroidRuntime(20521): at java.lang.Class.newInstance(Class.java:1319)
07-10 10:02:42.322: E/AndroidRuntime(20521): at android.app.Instrumentation.newActivity(Instrumentation.java:1023)
07-10 10:02:42.322: E/AndroidRuntime(20521): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1871)
07-10 10:02:42.322: E/AndroidRuntime(20521): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
07-10 10:02:42.322: E/AndroidRuntime(20521): at android.app.ActivityThread.access$600(ActivityThread.java:123)
07-10 10:02:42.322: E/AndroidRuntime(20521): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
07-10 10:02:42.322: E/AndroidRuntime(20521): at android.os.Handler.dispatchMessage(Handler.java:99)
07-10 10:02:42.322: E/AndroidRuntime(20521): at android.os.Looper.loop(Looper.java:137)
07-10 10:02:42.322: E/AndroidRuntime(20521): at android.app.ActivityThread.main(ActivityThread.java:4424)
07-10 10:02:42.322: E/AndroidRuntime(20521): at java.lang.reflect.Method.invokeNative(Native Method)
07-10 10:02:42.322: E/AndroidRuntime(20521): at java.lang.reflect.Method.invoke(Method.java:511)
07-10 10:02:42.322: E/AndroidRuntime(20521): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
07-10 10:02:42.322: E/AndroidRuntime(20521): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
07-10 10:02:42.322: E/AndroidRuntime(20521): at dalvik.system.NativeStart.main(Native Method)
07-10 10:02:42.352: I/dalvikvm(20521): threadid=3: reacting to signal 3
07-10 10:02:42.432: I/dalvikvm(20521): Wrote stack traces to '/data/anr/traces.txt'
07-10 10:02:42.632: I/dalvikvm(20521): threadid=3: reacting to signal 3
07-10 10:02:42.652: I/dalvikvm(20521): Wrote stack traces to '/data/anr/traces.txt'
07-10 10:02:43.122: I/dalvikvm(20521): threadid=3: reacting to signal 3
07-10 10:02:43.213: I/dalvikvm(20521): Wrote stack traces to '/data/anr/traces.txt'
如何解决这个问题？