编辑新年快乐!确切地说,我在Android Studio中创建了一个简单的音乐应用,可以从内部存储中读取mp3文件。一切都好,直到我决定在列表上的每条单曲上放一张随机图像。(在歌曲名称的前面,我想显示一幅图像。)当我在ImageView的“ src”中选择一幅图像时,它可以工作并出现在所有歌曲中。我将在下面介绍我的代码的一部分:主要活动:
package com.alg.amzar.spectrum;
import android.content.ContentResolver;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ImageView;
import android.widget.ListView;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Random;
public class MainActivity extends AppCompatActivity {
static {
System.loadLibrary("native-lib");
}
private ArrayList<Song> songList;
private ListView songView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
schimbare();
songView = (ListView)findViewById(R.id.song_list);
songList = new ArrayList<Song>();
getSongList();
Collections.sort(songList, new Comparator<Song>(){
public int compare(Song a, Song b){
return a.getTitle().compareTo(b.getTitle());
}
});
SongAdapter songAdt = new SongAdapter(this, songList);
songView.setAdapter(songAdt);
}
public void schimbare() {
int[] photos={R.drawable.img_0, R.drawable.img_1,R.drawable.img_2};
ImageView image = (ImageView) findViewById(R.id.imagine);
Random ran=new Random();
int i=ran.nextInt(photos.length);
image.setImageResource(photos[i]);
}
public void getSongList() {
ContentResolver musicResolver = getContentResolver();
Uri musicUri = android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
Cursor musicCursor = musicResolver.query(musicUri, null, null, null, null);
if(musicCursor!=null && musicCursor.moveToFirst()){
//get columns
int titleColumn = musicCursor.getColumnIndex
(android.provider.MediaStore.Audio.Media.TITLE);
int idColumn = musicCursor.getColumnIndex
(android.provider.MediaStore.Audio.Media._ID);
//add songs to list
do {
long thisId = musicCursor.getLong(idColumn);
String thisTitle = musicCursor.getString(titleColumn);
songList.add(new Song(thisId, thisTitle));
}
while (musicCursor.moveToNext());
}
}
public native String stringFromJNI();
}
活动主.xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:background="#FF330000"
tools:context=".MainActivity" >
<ListView
android:id="@+id/song_list"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
</ListView>
</LinearLayout>
Song.xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:onClick="songPicked"
android:orientation="vertical"
android:padding="5dp" >
<ImageView
android:layout_width="70dp"
android:id="@+id/imagine"
android:layout_height="50dp" />
<TextView
android:id="@+id/song_title"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="#FFFFFF99"
android:textSize="15sp"
android:textStyle="bold"
android:layout_marginBottom="20dp"
android:layout_marginLeft="75dp"
android:layout_marginTop="-42dp"/>
</LinearLayout>
除此之外,我还有2个Java类。我认为问题出在这里,但是idk出了什么问题:
public void schimbare() {
int[] photos={R.drawable.img_0, R.drawable.img_1,R.drawable.img_2};
ImageView image = (ImageView) findViewById(R.id.imagine);
Random ran=new Random();
int i=ran.nextInt(photos.length);
image.setImageResource(photos[i]);
}
我的另一个疑问是,何时使用.getDrawable时“不赞成使用”是什么意思。提前致谢!
Logcat:
ime: FATAL EXCEPTION: main
Process: com.alg.amzar.spectrum, PID: 28677
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.alg.amzar.spectrum/com.alg.amzar.spectrum.MainActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2381)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2433)
at android.app.ActivityThread.access$800(ActivityThread.java:155)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1346)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5341)
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:830)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:646)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.alg.amzar.spectrum.MainActivity.schimbare(MainActivity.java:57)
at com.alg.amzar.spectrum.MainActivity.onCreate(MainActivity.java:31)
at android.app.Activity.performCreate(Activity.java:5343)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1088)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2335)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2433)
at android.app.ActivityThread.access$800(ActivityThread.java:155)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1346)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5341)
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:830)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:646)
at dalvik.system.NativeStart.main(Native Method)
我的手机的android版本:4.4.2(API 19)目标SDK版本:“ 19” MinSDK版本:“ 14”
SongAdapter.java:
package com.alg.amzar.spectrum;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.LinearLayout;
import android.widget.TextView;
import java.util.ArrayList;
public class SongAdapter extends BaseAdapter {
private ArrayList<Song> songs;
private LayoutInflater songInf;
public SongAdapter(Context c, ArrayList<Song> theSongs) {
songs = theSongs;
songInf = LayoutInflater.from(c);
}
@Override
public int getCount() {
return songs.size();
}
@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
//map to song layout
LinearLayout songLay = (LinearLayout)songInf.inflate
(R.layout.song, parent, false);
//get title and artist views
TextView songView = (TextView)songLay.findViewById(R.id.song_title);
//get song using position
Song currSong = songs.get(position);
//get title and artist strings
songView.setText(currSong.getTitle());
//set position as tag
songLay.setTag(position);
return songLay;
}
}
在您的情况下,findViewById(R.id.imagine)
返回NULL,因为它在您提供的布局“ activity_main”中不存在setContentView()
。findViewById()
如果视图在当前布局中不存在,则返回NULL。R.id.imagine存在于布局song.xml中。
我认为,您正在尝试使用布局“歌曲”为ListView充气。只有充气后,您才能致电findViewById
和setImageResource
。膨胀之后,您可以在SongAdapter类中为ListView中的每个元素完成此操作。
另一个建议是,可以使用MediaMetadataRetriever类来获取歌曲的专辑封面,而不是使用随机图像。您可以参考android文档。但是您必须先解决此异常。
注释/删除功能schimbare()
onCreate和编辑SongAdapter如下所示。
package com.alg.amzar.spectrum;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.LinearLayout;
import android.widget.TextView;
import java.util.ArrayList;
public class SongAdapter extends BaseAdapter {
private ArrayList<Song> songs;
private LayoutInflater songInf;
int[] photos={R.drawable.img_0, R.drawable.img_1,R.drawable.img_2};
Random ran=new Random();
// CHECK THIS:
public SongAdapter(Context c, ArrayList<Song> theSongs) {
songs = theSongs;
// CHECK THIS:
songInf = ( LayoutInflater )c.
getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return songs.size();
}
@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
//map to song layout
LinearLayout songLay = (LinearLayout)songInf.inflate
(R.layout.song, null);
//get title and artist views
TextView songView = (TextView)songLay.findViewById(R.id.song_title);
// CHECK THIS:
ImageView img = (ImageView)songLay.findViewById(R.id.imagine);
//get song using position
Song currSong = songs.get(position);
//get title and artist strings
songView.setText(currSong.getTitle());
// CHECK THIS:
int i=ran.nextInt(photos.length);
img.setImageResource(photos[i]);
//set position as tag
songLay.setTag(position);
return songLay;
}
}
本文收集自互联网,转载请注明来源。
如有侵权,请联系[email protected] 删除。
我来说两句