正如标题所说，我正在尝试获得简化代码的帮助。我有多个按钮，现在我测试时只有三个，但我计划有大约 30 个按钮选择。目前我有一段很长的代码，我认为可以使用数组来大幅缩短它？但我不确定如何正确实施。如果有人以前这样做过或有想法，请分享！谢谢大家！
public class myDL extends Activity {
public static final int DIALOG_DOWNLOAD_PROGRESS = 0;
private Button startBtn;
private ProgressDialog mProgressDialog;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.filechoice);
mProgressDialog = new ProgressDialog(myDL.this);
mProgressDialog.setMessage("The file is now downloading, it will be saved on the SD card for future use. Please use WiFi to avoid operator charges.");
mProgressDialog.setIndeterminate(false);
mProgressDialog.setMax(100);
mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
Button section = (Button) findViewById(R.id.section);
section.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
// TODO Auto-generated method stub
Intent section = new Intent(view.getContext(),
section.class);
startActivity(section);
}
});
Button back = (Button) findViewById(R.id.back);
back.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
setResult(RESULT_OK);
finish();
}
});
secOne = (Button) findViewById(R.id.secOne);
secOne.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
startSecOne();
}
});
}
private void startSecOne() {
StartSecOne secOne = new StartSecOne();
secOne
.execute("www.website.com/document.pdf");
}
class StartSecOne extends AsyncTask<String, Integer, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
mProgressDialog.show();
}
@Override
protected void onProgressUpdate(Integer... progress) {
super.onProgressUpdate(progress);
mProgressDialog.setProgress(progress[0]);
}
@Override
protected String doInBackground(String... aurl) {
String isFileThere = Environment.getExternalStorageDirectory()
+ "/Android/Data/"
+ getApplicationContext().getPackageName()
+ "/files/test1.pdf";
File f = new File(isFileThere);
if (f.exists()) {
showPdf();
} else {
try {
URL url = new URL(aurl[0]);
URLConnection connection = url.openConnection();
connection.connect();
int fileLength = connection.getContentLength();
int tickSize = 2 * fileLength / 100;
int nextProgress = tickSize;
Log.d(
"ANDRO_ASYNC", "Lenght of file: " + fileLength);
InputStream input = new BufferedInputStream(
url.openStream());
String path = Environment.getExternalStorageDirectory()
+ "/Android/Data/"
+ getApplicationContext().getPackageName()
+ "/files";
File file = new File(path);
file.mkdirs();
File outputFile = new File(file, "test1.pdf");
OutputStream output = new FileOutputStream(outputFile);
byte data[] = new byte[1024 * 1024];
long total = 0;
int count;
while ((count = input.read(data)) != -1) {
total += count;
if (total >= nextProgress) {
nextProgress = (int) ((total / tickSize + 1) * tickSize);
this.publishProgress((int) (total * 100 / fileLength));
}
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
mProgressDialog.dismiss();
showPdf();
} catch (Exception e) {
}
}
return null;
}
}
secTwo = (Button) findViewById(R.id.secTwo);
secTwo.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
startSecTwo ();
}
});
}
private void startSecTwo () {
StartSecTwo secTwo = new StartSecTwo ();
secTwo
.execute("www.website.com/document2.pdf");
}
class StartSecTwo extends AsyncTask<String, Integer, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
mProgressDialog.show();
}
@Override
protected void onProgressUpdate(Integer... progress) {
super.onProgressUpdate(progress);
mProgressDialog.setProgress(progress[0]);
}
@Override
protected String doInBackground(String... aurl) {
String isFileThere = Environment.getExternalStorageDirectory()
+ "/Android/Data/"
+ getApplicationContext().getPackageName()
+ "/files/test2.pdf";
File f = new File(isFileThere);
if (f.exists()) {
showPdf();
} else {
try {
URL url = new URL(aurl[0]);
URLConnection connection = url.openConnection();
connection.connect();
int fileLength = connection.getContentLength();
int tickSize = 2 * fileLength / 100;
int nextProgress = tickSize;
Log.d(
"ANDRO_ASYNC", "Lenght of file: " + fileLength);
InputStream input = new BufferedInputStream(
url.openStream());
String path = Environment.getExternalStorageDirectory()
+ "/Android/Data/"
+ getApplicationContext().getPackageName()
+ "/files";
File file = new File(path);
file.mkdirs();
File outputFile = new File(file, "test2.pdf");
OutputStream output = new FileOutputStream(outputFile);
byte data[] = new byte[1024 * 1024];
long total = 0;
int count;
while ((count = input.read(data)) != -1) {
total += count;
if (total >= nextProgress) {
nextProgress = (int) ((total / tickSize + 1) * tickSize);
this.publishProgress((int) (total * 100 / fileLength));
}
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
mProgressDialog.dismiss();
showPdf();
} catch (Exception e) {
}
}
return null;
}
}
secThree = (Button) findViewById(R.id.secThree);
secThree.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
startSecThree ();
}
});
}
private void startSecThree () {
StartSecThree secThree = new StartSecThree ();
secThree
.execute("www.website.com/document3.pdf");
}
class StartSecThree extends AsyncTask<String, Integer, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
mProgressDialog.show();
}
@Override
protected void onProgressUpdate(Integer... progress) {
super.onProgressUpdate(progress);
mProgressDialog.setProgress(progress[0]);
}
@Override
protected String doInBackground(String... aurl) {
String isFileThere = Environment.getExternalStorageDirectory()
+ "/Android/Data/"
+ getApplicationContext().getPackageName()
+ "/files/test3.pdf";
File f = new File(isFileThere);
if (f.exists()) {
showPdf();
} else {
try {
URL url = new URL(aurl[0]);
URLConnection connection = url.openConnection();
connection.connect();
int fileLength = connection.getContentLength();
int tickSize = 2 * fileLength / 100;
int nextProgress = tickSize;
Log.d(
"ANDRO_ASYNC", "Lenght of file: " + fileLength);
InputStream input = new BufferedInputStream(
url.openStream());
String path = Environment.getExternalStorageDirectory()
+ "/Android/Data/"
+ getApplicationContext().getPackageName()
+ "/files";
File file = new File(path);
file.mkdirs();
File outputFile = new File(file, "test3.pdf");
OutputStream output = new FileOutputStream(outputFile);
byte data[] = new byte[1024 * 1024];
long total = 0;
int count;
while ((count = input.read(data)) != -1) {
total += count;
if (total >= nextProgress) {
nextProgress = (int) ((total / tickSize + 1) * tickSize);
this.publishProgress((int) (total * 100 / fileLength));
}
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
mProgressDialog.dismiss();
showPdf();
} catch (Exception e) {
}
}
return null;
}
}
private void showPdf() {
// TODO Auto-generated method stub
mProgressDialog.dismiss();
File file = new File(Environment.getExternalStorageDirectory()
+ "/Android/Data/"
+ getApplicationContext().getPackageName()
+ "/files/test1.pdf");
PackageManager packageManager = getPackageManager();
Intent testIntent = new Intent(Intent.ACTION_VIEW);
testIntent.setType("application/pdf");
List list = packageManager.queryIntentActivities(testIntent,
PackageManager.MATCH_DEFAULT_ONLY);
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
Uri uri = Uri.fromFile(file);
intent.setDataAndType(uri, "application/pdf");
startActivity(intent);
}
}