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携帯電話でアクティビティを開始すると、アプリが応答していないと表示されます。問題は、textView から前のテキストを収集するようにプログラムできないように見える戻るボタンです。

アクティビティの XML コード

<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="@drawable/background"
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=".Author" >

<TextView
    android:id="@+id/textView1"
    android:layout_width="300dp"
    android:layout_height="300dp"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:background="@drawable/button_shape"
    android:text="@string/Getstarted"
    android:textColor="#FFFFFF"
    android:textSize="23sp" />

<ImageButton
    android:id="@+id/next"
    android:layout_width="90dp"
    android:layout_height="50dp"
    android:layout_alignRight="@+id/textView1"
    android:layout_below="@+id/textView1"
    android:layout_marginTop="14dp"
    android:background="@drawable/button_shape"
    android:contentDescription="@string/Next"
    android:onClick="NextQuote"
    android:src="@drawable/navigationnextitem" />

<ImageButton
    android:id="@+id/share"
    android:layout_width="90dp"
    android:layout_height="50dp"
    android:layout_alignTop="@+id/next"
    android:layout_centerHorizontal="true"
    android:background="@drawable/button_shape"
    android:contentDescription="@string/share"
    android:onClick="Sharing"
    android:src="@drawable/socialshare" />

    <ImageButton
        android:id="@+id/back"
        android:layout_width="90dp"
        android:layout_height="50dp"
        android:layout_alignLeft="@+id/textView1"
        android:layout_alignTop="@+id/next"
        android:background="@drawable/button_shape"
        android:contentDescription="@string/Back"
        android:onClick="PreviousQuote"
        android:src="@drawable/navigationpreviousitem" />

</RelativeLayout>

アクティビティの Java コード

package com.android.motivateme3;

import java.util.Random;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.TextView;
import android.support.v4.app.NavUtils;
import android.annotation.TargetApi;
import android.content.Intent;
import android.os.Build;

public class Author extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_author);
        // 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);

             Button NextQuote = (Button)findViewById(R.id.next);
                final TextView display = (TextView) findViewById(R.id.textView1);
                NextQuote.setOnClickListener(new View.OnClickListener() {
                    public void onClick(View v) {
                        // TODO Auto-generated method stub
                         Random numGen = new Random();
                        int rNumber = numGen.nextInt(10);
                    if (rNumber  == 0)
                    {   
                        display.setText(R.string.Author1);
                    }
                    else if (rNumber  == 1)
                    {   
                        display.setText(R.string.Author2);
                    }
                    else if (rNumber  == 2)
                    { 
                        display.setText(R.string.Author3);
                    }
                    else if (rNumber  == 3)
                    {
                        display.setText(R.string.Author4);
                    }
                    else if (rNumber  == 4)
                    {
                        display.setText(R.string.Author5);
                    }
                    else if (rNumber  == 5)
                    {
                        display.setText(R.string.Author6);
                    }
                    else if (rNumber  == 6)
                    {
                        display.setText(R.string.Author7);
                    }
                    else if (rNumber  == 7)
                    {
                        display.setText(R.string.Author8);
                    }
                    else if (rNumber  == 8)
                    {
                        display.setText(R.string.Author9);
                    }
                    else if (rNumber  == 9)
                    {
                        display.setText(R.string.Author10);
                    }       }
                });
                        }

                    ImageButton Sharing = (ImageButton)findViewById(R.id.share);
                    Sharing.setOnClickListener(new View.OnClickListener() {
                        public void onClick(View v){

                        TextView text = (TextView)findViewById(R.id.textView1);
                        String quote = text.getText().toString();{
                        Intent shareIntent = new Intent(android.content.Intent.ACTION_SEND);
                        shareIntent.setType("plain/text");
                        shareIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "This is a great quote (from the Motivate Me! app)");
                        shareIntent.putExtra(android.content.Intent.EXTRA_TEXT, quote);
                        startActivity(Intent.createChooser(shareIntent, "Share via:"));}}});



                        Button BackQuote = (Button)findViewById(R.id.back);
                        final TextView display = (TextView) findViewById(R.id.textView1);
                        BackQuote.setOnClickListener(new View.OnClickListener() {
                            public void onClick(View v) {
                                String prev = (String) display.getText();
                                display.setText(prev);
                            }
                    });}


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.author, 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);
    }
}

これはスタックトレースです

04-03 14:29:34.174: E/AndroidRuntime(17383):    at android.app.ActivityThread.main(ActivityThread.java:4441)
04-03 14:29:34.174: E/AndroidRuntime(17383):    at java.lang.reflect.Method.invokeNative(Native Method)
04-03 14:29:34.174: E/AndroidRuntime(17383):    at java.lang.reflect.Method.invoke(Method.java:511)
04-03 14:29:34.174: E/AndroidRuntime(17383):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823)
04-03 14:29:34.174: E/AndroidRuntime(17383):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)
04-03 14:29:34.174: E/AndroidRuntime(17383):    at dalvik.system.NativeStart.main(Native Method)
04-03 14:29:34.174: E/AndroidRuntime(17383): Caused by: java.lang.ClassCastException: android.widget.ImageButton cannot be cast to android.widget.Button
04-03 14:29:34.174: E/AndroidRuntime(17383):    at com.android.motivateme3.Author.setupActionBar(Author.java:36)
04-03 14:29:34.174: E/AndroidRuntime(17383):    at com.android.motivateme3.Author.onCreate(Author.java:25)
04-03 14:29:34.174: E/AndroidRuntime(17383):    at android.app.Activity.performCreate(Activity.java:4465)
04-03 14:29:34.174: E/AndroidRuntime(17383):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
04-03 14:29:34.174: E/AndroidRuntime(17383):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1931)
04-03 14:29:34.174: E/AndroidRuntime(17383):    ... 11 more
04-03 14:29:41.664: I/Process(17383): Sending signal. PID: 17383 SIG: 9
4

1 に答える 1

0

R.id.next は、 のサブクラスではないため、ImageButtonにキャストできない を参照しているように思えます。ButtonButton

ClassCastException が表示されますか?

その特定の問題を修正するには、以下を置き換えます。

Button NextQuote = (Button)findViewById(R.id.next);

と

ImageButton NextQuote = (ImageButton)findViewById(R.id.next);
于 2013-04-03T13:30:40.463 に答える