我在 setContentView(R.layout.home); 这条线上遇到错误。因为我第一次遇到这个问题，不知道如何解决它。看来它正在设计考虑问题但不知道那是什么 这是我的代码
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.actionbarsherlock.app.SherlockActivity;
public class DialerActivity extends SherlockActivity{
TextView number;
Button call;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
Log.e("Dialer activity", "Dilaer Activity");
**setContentView(R.layout.home);**
number = (TextView)findViewById(R.id.displayNumber);
call = ((Button)findViewById(R.id.buttonDial));
}
}
这里是 xml:
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@android:color/white"
android:orientation="vertical" >
<com.android.phone91.DialPadView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:background="#ffffff" />
<Button
android:id="@+id/buttonDial"
android:layout_width="fill_parent"
android:layout_height="40dp"
android:layout_gravity="center"
android:layout_marginTop="10dp"
android:layout_marginLeft="40dp"
android:layout_marginRight="40dp"
android:layout_marginBottom="20dp"
android:text="Call"
android:textColor="@android:color/white"
android:background="@drawable/button_background"
android:gravity="center" >
</Button>
</LinearLayout>
</ScrollView>
拨号盘 View :
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import android.content.Context;
import android.media.MediaPlayer;
import android.os.Vibrator;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;
public class DialPadView extends LinearLayout implements OnClickListener {
LinearLayout buttons[] = new LinearLayout[12];
Button clearNumber;
TextView display;
Vibrator vibe;
int text_length;
MediaPlayer mp;
MainActivity hactivity;
public DialPadView(Context context, AttributeSet attrs) {
super(context, attrs);
hactivity = (MainActivity) context;
String infService = Context.LAYOUT_INFLATER_SERVICE;
LayoutInflater li;
li = (LayoutInflater) hactivity.getBaseContext().getSystemService(infService);
li.inflate(R.layout.dialpad, this, true);
vibe = (Vibrator) hactivity.getBaseContext().getSystemService(Context.VIBRATOR_SERVICE);
this.display = (TextView) findViewById(R.id.displayNumber);
this.buttons[0] = (LinearLayout) findViewById(R.id.button0);
this.buttons[1] = (LinearLayout) findViewById(R.id.button1);
this.buttons[2] = (LinearLayout) findViewById(R.id.button2);
this.buttons[3] = (LinearLayout) findViewById(R.id.button3);
this.buttons[4] = (LinearLayout) findViewById(R.id.button4);
this.buttons[5] = (LinearLayout) findViewById(R.id.button5);
this.buttons[6] = (LinearLayout) findViewById(R.id.button6);
this.buttons[7] = (LinearLayout) findViewById(R.id.button7);
this.buttons[8] = (LinearLayout) findViewById(R.id.button8);
this.buttons[9] = (LinearLayout) findViewById(R.id.button9);
this.buttons[10] = (LinearLayout) findViewById(R.id.buttonPlus);
this.buttons[11] = (LinearLayout) findViewById(R.id.buttonPound);
for (LinearLayout button: this.buttons) {
button.setOnClickListener(this);
}
this.clearNumber = (Button) findViewById(R.id.buttonClearNumber);
this.clearNumber.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v) {
text_length = display.length();
if (text_length > 0) {
//trim the last character off
String num = display.getText().toString();
display.setText(num.substring(0, num.length() - 1));
}
if (!((text_length - 1) > 0))
clearNumber.setVisibility(View.GONE);
}
});
this.clearNumber.setOnLongClickListener(new Button.OnLongClickListener() {
public boolean onLongClick(View v) {
display.setText("");
clearNumber.setVisibility(View.GONE);
return true;
}
});
}
public void onClick(View v) {
//Clear display if a message is displayed before adding a number
vibe.vibrate(50);
Pattern pattern = Pattern.compile("[0-9*#]");
Matcher matcher = pattern.matcher(this.display.getText().toString());
if (!matcher.find()) {
this.display.setText("");
}
if (!(text_length > 15))
switch (v.getId()) {
case R.id.button0:
if (mp != null && mp.isPlaying())
mp.stop();
mp = MediaPlayer.create(hactivity.getBaseContext(), R.raw.dtmf_0);
mp.start();
this.display.append("0");
break;
case R.id.button1:
if (mp != null && mp.isPlaying())
mp.stop();
mp = MediaPlayer.create(hactivity.getBaseContext(), R.raw.dtmf_1);
mp.start();
this.display.append("1");
break;
case R.id.button2:
if (mp != null && mp.isPlaying())
mp.stop();
mp = MediaPlayer.create(hactivity.getBaseContext(), R.raw.dtmf_2);
mp.start();
this.display.append("2");
break;
case R.id.button3:
if (mp != null && mp.isPlaying())
mp.stop();
mp = MediaPlayer.create(hactivity.getBaseContext(), R.raw.dtmf_3);
mp.start();
this.display.append("3");
break;
case R.id.button4:
if (mp != null && mp.isPlaying())
mp.stop();
mp = MediaPlayer.create(hactivity.getBaseContext(), R.raw.dtmf_4);
mp.start();
this.display.append("4");
break;
case R.id.button5:
if (mp != null && mp.isPlaying())
mp.stop();
mp = MediaPlayer.create(hactivity.getBaseContext(), R.raw.dtmf_5);
mp.start();
this.display.append("5");
break;
case R.id.button6:
if (mp != null && mp.isPlaying())
mp.stop();
mp = MediaPlayer.create(hactivity.getBaseContext(), R.raw.dtmf_6);
mp.start();
this.display.append("6");
break;
case R.id.button7:
if (mp != null && mp.isPlaying())
mp.stop();
mp = MediaPlayer.create(hactivity.getBaseContext(), R.raw.dtmf_7);
mp.start();
this.display.append("7");
break;
case R.id.button8:
if (mp != null && mp.isPlaying())
mp.stop();
mp = MediaPlayer.create(hactivity.getBaseContext(), R.raw.dtmf_8);
mp.start();
this.display.append("8");
break;
case R.id.button9:
if (mp != null && mp.isPlaying())
mp.stop();
mp = MediaPlayer.create(hactivity.getBaseContext(), R.raw.dtmf_9);
mp.start();
this.display.append("9");
break;
case R.id.buttonPlus:
if (mp != null && mp.isPlaying())
mp.stop();
mp = MediaPlayer.create(hactivity.getBaseContext(), R.raw.dtmf_star);
mp.start();
this.display.append("+");
break;
case R.id.buttonPound:
if (mp != null && mp.isPlaying())
mp.stop();
mp = MediaPlayer.create(hactivity.getBaseContext(), R.raw.dtmf_hash);
mp.start();
this.display.append("#");
break;
}
text_length = display.getText().length();
if (text_length > 0)
clearNumber.setVisibility(View.VISIBLE);
}
}
这是 Logcat:
12-12 16:56:23.921: E/AndroidRuntime(25644): FATAL EXCEPTION: main
12-12 16:56:23.921: E/AndroidRuntime(25644): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.phone91/com.android.phone91.DialerActivity}: android.view.InflateException: Binary XML file line #12: Error inflating class com.android.phone91.DialPadView
12-12 16:56:23.921: E/AndroidRuntime(25644): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2355)
12-12 16:56:23.921: E/AndroidRuntime(25644): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2391)
12-12 16:56:23.921: E/AndroidRuntime(25644): at android.app.ActivityThread.access$600(ActivityThread.java:151)
12-12 16:56:23.921: E/AndroidRuntime(25644): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1335)
12-12 16:56:23.921: E/AndroidRuntime(25644): at android.os.Handler.dispatchMessage(Handler.java:99)
12-12 16:56:23.921: E/AndroidRuntime(25644): at android.os.Looper.loop(Looper.java:155)
12-12 16:56:23.921: E/AndroidRuntime(25644): at android.app.ActivityThread.main(ActivityThread.java:5520)
12-12 16:56:23.921: E/AndroidRuntime(25644): at java.lang.reflect.Method.invokeNative(Native Method)
12-12 16:56:23.921: E/AndroidRuntime(25644): at java.lang.reflect.Method.invoke(Method.java:511)
12-12 16:56:23.921: E/AndroidRuntime(25644): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1029)
12-12 16:56:23.921: E/AndroidRuntime(25644): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:796)
12-12 16:56:23.921: E/AndroidRuntime(25644): at dalvik.system.NativeStart.main(Native Method)
12-12 16:56:23.921: E/AndroidRuntime(25644): Caused by: android.view.InflateException: Binary XML file line #12: Error inflating class com.android.phone91.DialPadView
12-12 16:56:23.921: E/AndroidRuntime(25644): at android.view.LayoutInflater.createView(LayoutInflater.java:613)
12-12 16:56:23.921: E/AndroidRuntime(25644): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:687)
12-12 16:56:23.921: E/AndroidRuntime(25644): at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
12-12 16:56:23.921: E/AndroidRuntime(25644): at android.view.LayoutInflater.rInflate(LayoutInflater.java:749)
12-12 16:56:23.921: E/AndroidRuntime(25644): at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
12-12 16:56:23.921: E/AndroidRuntime(25644): at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
12-12 16:56:23.921: E/AndroidRuntime(25644): at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
12-12 16:56:23.921: E/AndroidRuntime(25644): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:324)
12-12 16:56:23.921: E/AndroidRuntime(25644): at com.actionbarsherlock.internal.ActionBarSherlockNative.setContentView(ActionBarSherlockNative.java:119)
12-12 16:56:23.921: E/AndroidRuntime(25644): at com.actionbarsherlock.app.SherlockActivity.setContentView(SherlockActivity.java:218)
12-12 16:56:23.921: E/AndroidRuntime(25644): at com.android.phone91.DialerActivity.onCreate(DialerActivity.java:24)
12-12 16:56:23.921: E/AndroidRuntime(25644): at android.app.Activity.performCreate(Activity.java:5066)
12-12 16:56:23.921: E/AndroidRuntime(25644): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1101)
12-12 16:56:23.921: E/AndroidRuntime(25644): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2311)
12-12 16:56:23.921: E/AndroidRuntime(25644): ... 11 more
12-12 16:56:23.921: E/AndroidRuntime(25644): Caused by: java.lang.reflect.InvocationTargetException
12-12 16:56:23.921: E/AndroidRuntime(25644): at java.lang.reflect.Constructor.constructNative(Native Method)
12-12 16:56:23.921: E/AndroidRuntime(25644): at java.lang.reflect.Constructor.newInstance(Constructor.java:417)
12-12 16:56:23.921: E/AndroidRuntime(25644): at android.view.LayoutInflater.createView(LayoutInflater.java:587)
12-12 16:56:23.921: E/AndroidRuntime(25644): ... 24 more
12-12 16:56:23.921: E/AndroidRuntime(25644): Caused by: java.lang.ClassCastException: com.android.phone91.DialerActivity cannot be cast to com.android.phone91.MainActivity
12-12 16:56:23.921: E/AndroidRuntime(25644): at com.android.phone91.DialPadView.<init>(DialPadView.java:28)
12-12 16:56:23.921: E/AndroidRuntime(25644): ... 27 more
最佳答案
hactivity = (MainActivity) context;
传递给 DialPadView 的 context 是一个 DialerActivity，但您尝试将其转换为 MainActivity。
一般来说， View 不应该依赖于它们所显示的 Activity 。如果您需要编写这样的代码，请退一步并重新考虑设计。在您的情况下，您只需要一个 Context，而不是特定的 Activity - hactivity 的所有用途都在您使用它的地方作为上下文。
关于java - 二进制 XML 文件行 #12 : Error inflating class com. android.phone91.DialPadView，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/20542649/