Question

我有一个只显示1张图片的应用，通过$tbody[] = $row; // Birth Day Section $row = Form::label("year", _("Birth Date") . ":"); $aux = explode("-", ( !empty($formVar["birth_date"]) ) ? $formVar["birth_date"] : '0000-00-00'); $row .= Form::text("year", (intval($aux[0]) != 0) ? intval($aux[0]) : null, array('size' => 4) ); $row .= " - "; //$array = null; $array['1'] = _("1"); $array['2'] = _("2"); $array['3'] = _("3"); $array['4'] = _("4"); $array['5'] = _("5"); $array['6'] = _("6"); $array['7'] = _("7"); $array['8'] = _("8"); $array['9'] = _("9"); $array['10'] = _("10"); $array['11'] = _("11"); $array['12'] = _("12"); $row .= Form::select("month", $array, $formVar["month"]); //unset($array); $row .= " - "; $row .= Form::text("day", (intval($aux[2]) != 0) ? intval($aux[2]) : null, array('size' => 2) ); $row .= " " . _("(yyyy-mm-dd)"); unset($aux); if ($formError["birth_date"] != "") { $row .= Msg::error($formError["birth_date"]); }实现。如果我用简单的toast替换内容，Picasso工作正常，所以它必须是onClick调用。我不知道它为什么会一直崩溃。

MediaPlayer

}

XML：

package com.example.andrew.crossfade;
import android.media.MediaPlayer;
import android.support.v7.app.ActionBarActivity;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import com.squareup.picasso.Picasso;

public class MainActivity extends ActionBarActivity{

MediaPlayer mp;

@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    getSupportActionBar().hide();
    setContentView(R.layout.activity_main);
    if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction()
                .add(R.id.container, new PlaceholderFragment())
                .commit();
    }

    ImageView imageView = (ImageView) findViewById(R.id.imageView);
    imageView.setClickable(true);

    Picasso.with(this)
            .load("http://i.imgur.com/vpeH7S2.jpg")
            .into(imageView);

    imageView.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            mp = MediaPlayer.create(MainActivity.this, R.raw.later);
            mp.start();
        }

    });

}
public static class PlaceholderFragment extends Fragment {

    public PlaceholderFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_main, container, false);
        return rootView;
    }
}

最后，日志猫：

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:id="@+id/container"
android:layout_width="match_parent" android:layout_height="match_parent"
tools:context=".MainActivity" tools:ignore="MergeRootFrame" >

<ImageView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/imageView"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"

    />

Answer 1

代码中的某些内容为空

显示java.lang.NullPointerException

在开始之前调用mp.prepare（）并确保R.raw.later是媒体播放器的可播放音频

调用start（）时，MediaPlayer onClick崩溃

1 个答案: