有人能告诉我如何复制在一个特定的文本视图到剪贴板，当一个按钮被按下?
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mainpage);
textView = (TextView) findViewById(R.id.textview);
copyText = (Button) findViewById(R.id.bCopy);
copyText.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
ClipboardManager clipboard = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
String getstring = textView.getText().toString();
// Help to continue :)
}
});
}
我想复制文本在TextView TextView到剪贴板时，按钮bCopy按下。
要搜索剪贴板列表，首先像这样获取剪贴板对象:
private val clipboard = context.getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
然后通过这个函数检查剪贴板中是否有数据:
fun isClipboardContainsData() : Boolean{
return when{
!clipboard.hasPrimaryClip() -> false
else -> true
}
}
然后使用这个函数遍历剪贴板对象，如下所示:
fun searchClipboard() : ClipData.Item? {
return if (isClipboardContainsData()){
val items = clipboard.primaryClip
val clipboardSize = items?.itemCount ?: 0
for (i in 0..clipboardSize) {
val item = items?.getItemAt(i)
return if (item != null){
return item
}else
null
}
return null
}else
null
}
这里你可以看到searchClipboard Item将返回一个类型为ClipData的项。项时，剪贴板包含ClipData的列表。项目，如果你学习clipboard的实现这就是关于ClipData的内容。单品:
public static class Item {
final CharSequence mText;
final String mHtmlText;
final Intent mIntent;
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
Uri mUri;
}
所以你可以在剪贴板项目中保存的内容类型可以是:
CharSequence进行
字符串
意图(支持复制应用程序快捷方式)
Uri(用于从内容提供程序复制复杂数据)
昨天我做了这门课。拿去吧，它适用于所有API级别
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import android.annotation.SuppressLint;
import android.content.ClipData;
import android.content.ClipboardManager;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.res.AssetFileDescriptor;
import android.net.Uri;
import android.util.Log;
import de.lochmann.nsafirewall.R;
public class MyClipboardManager {
@SuppressLint("NewApi")
@SuppressWarnings("deprecation")
public boolean copyToClipboard(Context context, String text) {
try {
int sdk = android.os.Build.VERSION.SDK_INT;
if (sdk < android.os.Build.VERSION_CODES.HONEYCOMB) {
android.text.ClipboardManager clipboard = (android.text.ClipboardManager) context
.getSystemService(context.CLIPBOARD_SERVICE);
clipboard.setText(text);
} else {
android.content.ClipboardManager clipboard = (android.content.ClipboardManager) context
.getSystemService(context.CLIPBOARD_SERVICE);
android.content.ClipData clip = android.content.ClipData
.newPlainText(
context.getResources().getString(
R.string.message), text);
clipboard.setPrimaryClip(clip);
}
return true;
} catch (Exception e) {
return false;
}
}
@SuppressLint("NewApi")
public String readFromClipboard(Context context) {
int sdk = android.os.Build.VERSION.SDK_INT;
if (sdk < android.os.Build.VERSION_CODES.HONEYCOMB) {
android.text.ClipboardManager clipboard = (android.text.ClipboardManager) context
.getSystemService(context.CLIPBOARD_SERVICE);
return clipboard.getText().toString();
} else {
ClipboardManager clipboard = (ClipboardManager) context
.getSystemService(Context.CLIPBOARD_SERVICE);
// Gets a content resolver instance
ContentResolver cr = context.getContentResolver();
// Gets the clipboard data from the clipboard
ClipData clip = clipboard.getPrimaryClip();
if (clip != null) {
String text = null;
String title = null;
// Gets the first item from the clipboard data
ClipData.Item item = clip.getItemAt(0);
// Tries to get the item's contents as a URI pointing to a note
Uri uri = item.getUri();
// If the contents of the clipboard wasn't a reference to a
// note, then
// this converts whatever it is to text.
if (text == null) {
text = coerceToText(context, item).toString();
}
return text;
}
}
return "";
}
@SuppressLint("NewApi")
public CharSequence coerceToText(Context context, ClipData.Item item) {
// If this Item has an explicit textual value, simply return that.
CharSequence text = item.getText();
if (text != null) {
return text;
}
// If this Item has a URI value, try using that.
Uri uri = item.getUri();
if (uri != null) {
// First see if the URI can be opened as a plain text stream
// (of any sub-type). If so, this is the best textual
// representation for it.
FileInputStream stream = null;
try {
// Ask for a stream of the desired type.
AssetFileDescriptor descr = context.getContentResolver()
.openTypedAssetFileDescriptor(uri, "text/*", null);
stream = descr.createInputStream();
InputStreamReader reader = new InputStreamReader(stream,
"UTF-8");
// Got it... copy the stream into a local string and return it.
StringBuilder builder = new StringBuilder(128);
char[] buffer = new char[8192];
int len;
while ((len = reader.read(buffer)) > 0) {
builder.append(buffer, 0, len);
}
return builder.toString();
} catch (FileNotFoundException e) {
// Unable to open content URI as text... not really an
// error, just something to ignore.
} catch (IOException e) {
// Something bad has happened.
Log.w("ClippedData", "Failure loading text", e);
return e.toString();
} finally {
if (stream != null) {
try {
stream.close();
} catch (IOException e) {
}
}
}
// If we couldn't open the URI as a stream, then the URI itself
// probably serves fairly well as a textual representation.
return uri.toString();
}
// Finally, if all we have is an Intent, then we can just turn that
// into text. Not the most user-friendly thing, but it's something.
Intent intent = item.getIntent();
if (intent != null) {
return intent.toUri(Intent.URI_INTENT_SCHEME);
}
// Shouldn't get here, but just in case...
return "";
}
}
