最近在做播放器项目，由于Android兼容性问题，硬解各种不兼容搞得项目组成员焦头烂额，为了方便测试分析，我做了个小工具，来测试不同的Android手机支持的×××格式以及×××名称。为防止，以后遗忘，在这里写篇博客记录之。

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MainActivity代码:

@SuppressLint("NewApi")

public class MainActivity extends Activity implements OnClickListener {

private ListView decoder

List;

private ArrayList> datas = new ArrayList>();

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

Button retrieve = (Button) findViewById(R.id.retrieve);

retrieve.setOnClickListener(this);

decoderList = (ListView) findViewById(R.id.decoderList);

}

@Override

public void onClick(View v) {

// MediaCodecInfo mediaCodecInfo = getSupportDecoder(

// MediaFormat.MIMETYPE_VIDEO_VP8, (Button) v);

getSupportDecoder((Button) v);

}

private MediaCodecInfo getSupportDecoder(Button button) {

button.setText("正在检测...");

int numCodecs = MediaCodecList.getCodecCount();

HashMap map;

for (int i = 0; i < numCodecs; i++) {

MediaCodecInfo codecInfo = MediaCodecList.getCodecInfoAt(i);

map = new HashMap();

if (!codecInfo.isEncoder()) {

continue;

}

map.put("decoderName", codecInfo.getName());

String[] types = codecInfo.getSupportedTypes();

for (int j = 0; j < types.length; j++) {

if (map.containsValue(types[j])) {

continue;

} else {

map.put("decoderType", types[j]);

}

}

datas.add(map);

}

decoderList.setAdapter(new DecodeListAdapter(this, datas));

decoderList.setVisibility(View.VISIBLE);

button.setText("开始检测");

return null;

}

}

斜体加粗部分是核心函数。

ListView适配器:

public class DecodeListAdapter extends BaseAdapter {

private ArrayList> decodeList;

private Context context;

public DecodeListAdapter(Context context,

ArrayList> decodeList) {

this.context = context;

this.decodeList = decodeList;

}

@Override

public int getCount() {

// TODO Auto-generated method stub

return decodeList.size();

}

@Override

public HashMap getItem(int position) {

// TODO Auto-generated method stub

return decodeList.get(position);

}

@Override

public long getItemId(int position) {

// TODO Auto-generated method stub

return position;

}

@Override

public View getView(int position, View convertView, ViewGroup parent) {

HashMap map = getItem(position);

ViewHolder vh = null;

if (convertView == null) {

convertView = LayoutInflater.from(context).inflate(

R.layout.decode_list_item, null);

vh = new ViewHolder();

vh.decoderName = (TextView) convertView

.findViewById(R.id.decoderName);

vh.decoderType = (TextView) convertView

.findViewById(R.id.decoderType);

convertView.setTag(vh);

} else {

vh = (ViewHolder) convertView.getTag();

}

if (position == 0) {

vh.decoderName.setText("×××名称");

vh.decoderType.setText("×××类型");

} else {

vh.decoderName.setText(map.get("decoderName"));

vh.decoderType.setText(map.get("decoderType"));

}

return convertView;

}

private class ViewHolder {

TextView decoderName;

TextView decoderType;

}

}

activity_main.xml代码:

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    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="com.marller.decoderlist.MainActivity" >

        android:id="@+id/retrieve"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="开始检测" />

        android:id="@+id/decoderList"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:cacheColorHint="#00000000"

        android:visibility="gone" />

decode_list_item.xml代码:

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="horizontal"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context="com.marller.decoderlist.MainActivity" >

        android:id="@+id/decoderName"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_weight="1.0"

        android:gravity="center"

        android:text="开始检测" />

        android:id="@+id/decoderType"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:layout_weight="1.0"

        android:gravity="center" />