我正在尝试显示54x52 PNG文件。我查看了整个网络，所有教程都有OnClickListener（）或其他内容。 This是我想到的形象。我希望此图像显示在屏幕的右下角。如果单击图像，我不希望应用程序执行任何操作，并且我希望在应用程序在屏幕上的整个时间显示此图像。我该怎么做？我的/res/layout/main.xml会是什么样子，以及实际的源代码本身？
到目前为止，这是我的/res/layout/main.xml：
<?xml version="1.0" encoding="utf-8"?>
<ScrollView android:layout_width="fill_parent" android:layout_height="fill_parent" android:fillViewport="true" xmlns:android="http://schemas.android.com/apk/res/android">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" android:padding="10dp">
<Button android:id="@+id/open" android:layout_width="match_parent" android:layout_height="wrap_content" android:onClick="OpenClicked" android:text="Open MIDI file..." />
<TextView android:id="@+id/title" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center_horizontal" android:paddingTop="10dp" android:textAppearance="?android:attr/textAppearanceMedium" />
<SeekBar android:id="@+id/position" android:layout_width="match_parent" android:layout_height="wrap_content" android:max="0" android:paddingTop="10dp" />
<LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:paddingTop="10dp">
<LinearLayout android:id="@+id/linearLayout1" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="1" android:orientation="vertical">
<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Tempo (in BPM)" android:textAppearance="?android:attr/textAppearanceSmall" />
<SeekBar android:id="@+id/tempo" android:layout_width="match_parent" android:layout_height="wrap_content" android:max="20" android:progress="10" />
<TextView android:id="@+id/bpm" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center_horizontal" android:textAppearance="?android:attr/textAppearanceMedium" />
</LinearLayout>
<CheckBox android:id="@+id/effects" android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="EffectsClicked" android:text="Reverb & Chorus" android:layout_marginLeft="10dp" android:checked="true" />
</LinearLayout>
<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Lyrics" android:paddingTop="10dp" android:textAppearance="?android:attr/textAppearanceSmall" />
<TextView android:id="@+id/lyrics" android:layout_width="match_parent" android:layout_height="wrap_content" android:textAppearance="?android:attr/textAppearanceMedium" android:minLines="3" android:gravity="center_horizontal" />
<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Soundfont (.SF2 file)" android:paddingTop="10dp" android:textAppearance="?android:attr/textAppearanceSmall" />
<LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content">
<TextView android:id="@+id/fontinfo" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:textAppearance="?android:attr/textAppearanceMedium" />
<Button android:id="@+id/openfont" android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="OpenFontClicked" android:text="Browse..." />
</LinearLayout>
</LinearLayout>
这是我的主要.java文件：
package com.theblackmidimasta.bassmidiplayer;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.ImageView;
import android.widget.SeekBar;
import android.widget.TextView;
import java.io.File;
import com.un4seen.bass.BASS;
import com.un4seen.bass.BASSMIDI;
public class MIDIPlayer extends Activity {
int chan; // channel handle
int font; // soundfont
int miditempo; // MIDI file tempo
float temposcale=1; // tempo adjustment
int updatefont;
String lyrics; // lyrics buffer
ImageView image;
Handler handler=new Handler();
File filepath;
String[] filelist;
class RunnableParam implements Runnable {
Object param;
RunnableParam(Object p) { param=p; }
public void run() {}
}
// display error messages
void Error(String es) {
// get error code in current thread for display in UI thread
String s=String.format("%s", es, BASS.BASS_ErrorGetCode());
runOnUiThread(new RunnableParam(s) {
public void run() {
new AlertDialog.Builder(MIDIPlayer.this)
.setMessage((String)param)
.setPositiveButton("OK", null)
.show();
}
});
}
BASS.SYNCPROC LyricSync=new BASS.SYNCPROC() {
public void SYNCPROC(int handle, int channel, int data, Object user) {
BASSMIDI.BASS_MIDI_MARK mark=new BASSMIDI.BASS_MIDI_MARK();
BASSMIDI.BASS_MIDI_StreamGetMark(channel, (Integer)user, data, mark); // get the lyric/text
if (mark.text.charAt(0)=='@') return; // skip info
if (mark.text.charAt(0)=='\\') // clear display
lyrics+="\n\n"+mark.text.substring(1);
else if (mark.text.charAt(0)=='/') // new line
lyrics+="\n"+mark.text.substring(1);
else
lyrics+=mark.text;
int lines, nlpos=0;
for (lines=1; (nlpos=lyrics.indexOf('\n', nlpos))>=0; lines++, nlpos++) ; // count lines
if (lines>3) { // remove old lines so that new lines fit in display...
nlpos=0;
do {
nlpos=lyrics.indexOf('\n', nlpos)+1;
} while (--lines>3);
lyrics=lyrics.substring(nlpos);
}
runOnUiThread(new Runnable() {
public void run() {
((TextView)findViewById(R.id.lyrics)).setText(lyrics);
}
});
}
};
BASS.SYNCPROC EndSync=new BASS.SYNCPROC() {
public void SYNCPROC(int handle, int channel, int data, Object user) {
lyrics=""; // clear lyrics
runOnUiThread(new Runnable() {
public void run() {
((TextView)findViewById(R.id.lyrics)).setText("");
}
});
}
};
void SetTempo(boolean reset)
{
if (reset) miditempo=BASSMIDI.BASS_MIDI_StreamGetEvent(chan, 0, BASSMIDI.MIDI_EVENT_TEMPO); // get the file's tempo
BASSMIDI.BASS_MIDI_StreamEvent(chan, 0, BASSMIDI.MIDI_EVENT_TEMPO, (int)(miditempo*temposcale)); // set tempo
}
BASS.SYNCPROC TempoSync=new BASS.SYNCPROC() {
public void SYNCPROC(int handle, int channel, int data, Object user) {
SetTempo(true); // override the tempo
}
};
// look for a marker (eg. loop points)
boolean FindMarker(int handle, String text, BASSMIDI.BASS_MIDI_MARK mark)
{
for (int a=0; BASSMIDI.BASS_MIDI_StreamGetMark(handle, BASSMIDI.BASS_MIDI_MARK_MARKER, a, mark); a++) {
if (mark.text.equals(text)) return true; // found it
}
return false;
}
BASS.SYNCPROC LoopSync=new BASS.SYNCPROC() {
public void SYNCPROC(int handle, int channel, int data, Object user) {
BASSMIDI.BASS_MIDI_MARK mark=new BASSMIDI.BASS_MIDI_MARK();
if (FindMarker(channel, "loopstart", mark)) // found a loop start point
BASS.BASS_ChannelSetPosition(channel, mark.pos, BASS.BASS_POS_BYTE|BASSMIDI.BASS_MIDI_DECAYSEEK); // rewind to it (and let old notes decay)
else
BASS.BASS_ChannelSetPosition(channel, 0, BASS.BASS_POS_BYTE|BASSMIDI.BASS_MIDI_DECAYSEEK); // else rewind to the beginning instead
}
};
public void OpenClicked(View v) {
String[] list=filepath.list();
if (list==null) list=new String[0];
if (!filepath.getPath().equals("/")) {
filelist=new String[list.length+1];
filelist[0]="..";
System.arraycopy(list, 0, filelist, 1, list.length);
} else
filelist=list;
new AlertDialog.Builder(this)
.setTitle("Coose a MIDI file to play")
.setItems(filelist, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
File sel;
if (filelist[which].equals("..")) sel=filepath.getParentFile();
else sel=new File(filepath, filelist[which]);
if (sel.isDirectory()) {
filepath=sel;
OpenClicked(null);
} else {
String file=sel.getPath();
BASS.BASS_StreamFree(chan); // free old stream before opening new
((TextView)findViewById(R.id.lyrics)).setText(""); // clear lyrics display
if ((chan=BASSMIDI.BASS_MIDI_StreamCreateFile(file, 0, 0, BASS.BASS_SAMPLE_LOOP|(((CheckBox)findViewById(R.id.effects)).isChecked()?0:BASSMIDI.BASS_MIDI_NOFX), 1))==0) {
// it ain't a MIDI
((Button)findViewById(R.id.open)).setText("Open MIDI file...");
((TextView)findViewById(R.id.title)).setText("");
((SeekBar)findViewById(R.id.position)).setMax(0);
Error("Unsupported File Format! (it ain't a MIDI)");
return;
}
((Button)findViewById(R.id.open)).setText(file);
// set the title (track name of first track)
BASSMIDI.BASS_MIDI_MARK mark=new BASSMIDI.BASS_MIDI_MARK();
if (BASSMIDI.BASS_MIDI_StreamGetMark(chan, BASSMIDI.BASS_MIDI_MARK_TRACK, 0, mark) && mark.track==0)
((TextView)findViewById(R.id.title)).setText(mark.text);
else
((TextView)findViewById(R.id.title)).setText("");
// update pos scroller range (using tick length)
((SeekBar)findViewById(R.id.position)).setMax((int)BASS.BASS_ChannelGetLength(chan, BASSMIDI.BASS_POS_MIDI_TICK)/120);
// set looping syncs
if (FindMarker(chan, "loopend", mark)) // found a loop end point
BASS.BASS_ChannelSetSync(chan, BASS.BASS_SYNC_POS|BASS.BASS_SYNC_MIXTIME, mark.pos, LoopSync, 0); // set a sync there
BASS.BASS_ChannelSetSync(chan, BASS.BASS_SYNC_END|BASS.BASS_SYNC_MIXTIME, 0, LoopSync, 0); // set one at the end too (eg. in case of seeking past the loop point)
// clear lyrics buffer and set lyrics syncs
lyrics="";
if (BASSMIDI.BASS_MIDI_StreamGetMark(chan, BASSMIDI.BASS_MIDI_MARK_LYRIC, 0, mark)) // got lyrics
BASS.BASS_ChannelSetSync(chan, BASSMIDI.BASS_SYNC_MIDI_MARK, BASSMIDI.BASS_MIDI_MARK_LYRIC, LyricSync, (Integer)BASSMIDI.BASS_MIDI_MARK_LYRIC);
else if (BASSMIDI.BASS_MIDI_StreamGetMark(chan, BASSMIDI.BASS_MIDI_MARK_TEXT, 20, mark)) // got text instead (over 20 of them)
BASS.BASS_ChannelSetSync(chan, BASSMIDI.BASS_SYNC_MIDI_MARK, BASSMIDI.BASS_MIDI_MARK_TEXT, LyricSync, (Integer)BASSMIDI.BASS_MIDI_MARK_TEXT);
BASS.BASS_ChannelSetSync(chan, BASS.BASS_SYNC_END, 0, EndSync,0);
// override the initial tempo, and set a sync to override tempo events and another to override after seeking
SetTempo(true);
BASS.BASS_ChannelSetSync(chan, BASSMIDI.BASS_SYNC_MIDI_EVENT|BASS.BASS_SYNC_MIXTIME, BASSMIDI.MIDI_EVENT_TEMPO, TempoSync, 0);
BASS.BASS_ChannelSetSync(chan,BASS.BASS_SYNC_SETPOS|BASS.BASS_SYNC_MIXTIME, 0, TempoSync, 0);
// get default soundfont in case of matching soundfont being used
BASSMIDI.BASS_MIDI_FONT[] sf=new BASSMIDI.BASS_MIDI_FONT[1];
if (BASSMIDI.BASS_MIDI_StreamGetFonts(chan, sf, 1)>0)
font=sf[0].font;
// limit CPU usage to 70% and start playing
BASS.BASS_ChannelSetAttribute(chan, BASSMIDI.BASS_ATTRIB_MIDI_CPU, 70);
BASS.BASS_ChannelPlay(chan, false);
}
}
})
.show();
}
public void OpenFontClicked(View v) {
String[] list=filepath.list();
if (list==null) list=new String[0];
if (!filepath.getPath().equals("/")) {
filelist=new String[list.length+1];
filelist[0]="..";
System.arraycopy(list, 0, filelist, 1, list.length);
} else
filelist=list;
new AlertDialog.Builder(this)
.setTitle("Choose a soundfont to use")
.setItems(filelist, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
File sel;
if (filelist[which].equals("..")) sel=filepath.getParentFile();
else sel=new File(filepath, filelist[which]);
if (sel.isDirectory()) {
filepath=sel;
OpenFontClicked(null);
} else {
String file=sel.getPath();
int newfont=BASSMIDI.BASS_MIDI_FontInit(file, 0);
if (newfont==0) {
Error("Unsupported File Format! (it ain't a SoundFont)");
} else {
BASSMIDI.BASS_MIDI_FONT[] sf={new BASSMIDI.BASS_MIDI_FONT()};
sf[0].font=newfont;
sf[0].preset=-1; // use all presets
sf[0].bank=0; // use default bank(s)
BASSMIDI.BASS_MIDI_StreamSetFonts(0, sf, 1); // set default soundfont
BASSMIDI.BASS_MIDI_StreamSetFonts(chan, sf, 1); // set for current stream too
BASSMIDI.BASS_MIDI_FontFree(font); // free old soundfont
font=newfont;
}
}
}
})
.show();
}
public void EffectsClicked(View v) {
if (((CheckBox)v).isChecked())
BASS.BASS_ChannelFlags(chan, 0, BASSMIDI.BASS_MIDI_NOFX); // enable FX
else
BASS.BASS_ChannelFlags(chan, BASSMIDI.BASS_MIDI_NOFX, BASSMIDI.BASS_MIDI_NOFX); // disable FX
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
filepath=Environment.getExternalStorageDirectory();
// initialize default output device
if (!BASS.BASS_Init(-1, 44100, 0)) {
Error("Can't initialize audio device!");
return;
}
// load optional plugins for packed soundfonts
String libpath=getApplicationInfo().nativeLibraryDir;
BASS.BASS_PluginLoad(libpath+"/libbassflac.so", 0);
BASS.BASS_PluginLoad(libpath+"/libbasswv.so", 0);
((SeekBar)findViewById(R.id.position)).setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onStopTrackingTouch(SeekBar seekBar) {}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {}
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
if (fromUser) {
BASS.BASS_ChannelSetPosition(chan, progress*120, BASSMIDI.BASS_POS_MIDI_TICK); // set the position
// clear lyrics
lyrics="";
((TextView)findViewById(R.id.lyrics)).setText("");
}
}
});
((SeekBar)findViewById(R.id.tempo)).setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onStopTrackingTouch(SeekBar seekBar) {}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {}
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
if (fromUser) {
temposcale=1/((10+progress)/20.f); // up to +/- 50% bpm
SetTempo(false); // apply the tempo adjustment
}
}
});
// timer to update the display
Runnable timer=new Runnable() {
public void run()
{
if (chan!=0) {
((SeekBar)findViewById(R.id.position)).setProgress((int)BASS.BASS_ChannelGetPosition(chan, BASSMIDI.BASS_POS_MIDI_TICK)/120); // update position
((TextView)findViewById(R.id.bpm)).setText(String.format("%.1f", 60000000/(miditempo*temposcale))); // update bpm
}
if ((++updatefont&1)==1) { // only updating font info once a second
String text="None";
BASSMIDI.BASS_MIDI_FONTINFO i=new BASSMIDI.BASS_MIDI_FONTINFO();
if (BASSMIDI.BASS_MIDI_FontGetInfo(font, i))
text=String.format("%s", i.name, i.samload, i.samsize);
((TextView)findViewById(R.id.fontinfo)).setText(text);
}
handler.postDelayed(this, 500);
}
};
handler.postDelayed(timer, 500);
}
@Override
public void onDestroy() {
// free the output device and all plugins and the soundfont
BASS.BASS_Free();
BASS.BASS_PluginFree(0);
BASSMIDI.BASS_MIDI_FontFree(font);
super.onDestroy();
}
}