狂刷Android范例之2：剪贴板范例ClipboardSample
说明
狂刷Android范例系列文章开张了。每篇学习一个Android范例，将一个范例单独生成一个可运行的app，并对重点源代码进行简要分析。然后提供打包好的源代码下载。
功能
功能很简单，使用Android提供的剪贴板，复制不同类型的数据到剪贴板。
代码包在此，无需下载分：
http://download.csdn.net/detail/logicteamleader/8786187
来源
ClipboardSample例子来自于Android-20的com.example.android.apis.content.ClipboardSample。
环境
代码运行环境：
1.ADT2014版本；
2.android:minSdkVersion=”16”；android:targetSdkVersion=”20”
3.workspace中已经生成了appcompatv7，它的版本是android-22；
代码
注意几个重点的类和方法：剪贴板管理器ClipboardManager，切片数据类ClipData，数组适配器类ArrayAdapter，getSystemService(CLIPBOARD_SERVICE)方法。
其他内容研究代码即可。
/**
* Copyright (c) 2010, The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.clipboardsample;
import android.app.Activity;
import android.content.ClipData;
import android.content.ClipboardManager;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.text.method.LinkMovementMethod;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;
public class ClipboardSample extends Activity {
ClipboardManager mClipboard;
Spinner mSpinner;
TextView mMimeTypes;
TextView mDataText;
CharSequence mStyledText;
String mPlainText;
String mHtmlText;
String mHtmlPlainText;
ClipboardManager.OnPrimaryClipChangedListener mPrimaryChangeListener
= new ClipboardManager.OnPrimaryClipChangedListener() {
public void onPrimaryClipChanged() {
updateClipData(true);
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// 通过getSystemService(CLIPBOARD_SERVICE)得到剪切板管理器
mClipboard = (ClipboardManager)getSystemService(CLIPBOARD_SERVICE);
// See res/any/layout/resources.xml for this view layout definition.
setContentView(R.layout.clipboard);
TextView tv;
mStyledText = getText(R.string.styled_text);
tv = (TextView)findViewById(R.id.styled_text);
tv.setText(mStyledText);
mPlainText = mStyledText.toString();
tv = (TextView)findViewById(R.id.plain_text);
tv.setText(mPlainText);
mHtmlText = "<b>Link:</b> <a href="http://www.android.com">Android</a>";
mHtmlPlainText = "Link: http://www.android.com";
tv = (TextView)findViewById(R.id.html_text);
tv.setText(mHtmlText);
mSpinner = (Spinner) findViewById(R.id.clip_type);
//这三行代码创建了一个Spinner使用的经典ArrayAdapter，其中用到了资源文件R.array.clip_data_types
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
this, R.array.clip_data_types, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
mSpinner.setAdapter(adapter);
mSpinner.setOnItemSelectedListener(
new OnItemSelectedListener() {
public void onItemSelected(
AdapterView<?> parent, View view, int position, long id) {
updateClipData(false);
}
public void onNothingSelected(AdapterView<?> parent) {
}
});
mMimeTypes = (TextView)findViewById(R.id.clip_mime_types);
mDataText = (TextView)findViewById(R.id.clip_text);
mClipboard.addPrimaryClipChangedListener(mPrimaryChangeListener);
updateClipData(true);
}
@Override
protected void onDestroy() {
super.onDestroy();
mClipboard.removePrimaryClipChangedListener(mPrimaryChangeListener);
}
public void pasteStyledText(View button) {
mClipboard.setPrimaryClip(ClipData.newPlainText("Styled Text", mStyledText));
}
public void pastePlainText(View button) {
mClipboard.setPrimaryClip(ClipData.newPlainText("Styled Text", mPlainText));
}
public void pasteHtmlText(View button) {
mClipboard.setPrimaryClip(ClipData.newHtmlText("HTML Text", mHtmlPlainText, mHtmlText));
}
public void pasteIntent(View button) {
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.android.com/"));
mClipboard.setPrimaryClip(ClipData.newIntent("VIEW intent", intent));
}
public void pasteUri(View button) {
mClipboard.setPrimaryClip(ClipData.newRawUri("URI", Uri.parse("http://www.android.com/")));
}
// 更新剪切板内容的函数
void updateClipData(boolean updateType) {
ClipData clip = mClipboard.getPrimaryClip();
String[] mimeTypes = clip != null ? clip.getDescription().filterMimeTypes("*/*") : null;
if (mimeTypes != null) {
mMimeTypes.setText("");
for (int i=0; i<mimeTypes.length; i++) {
if (i > 0) {
mMimeTypes.append("n");
}
mMimeTypes.append(mimeTypes[i]);
}
} else {
mMimeTypes.setText("NULL");
}
if (updateType) {
if (clip != null) {
ClipData.Item item = clip.getItemAt(0);
if (item.getHtmlText() != null) {
mSpinner.setSelection(2);
} else if (item.getText() != null) {
mSpinner.setSelection(1);
} else if (item.getIntent() != null) {
mSpinner.setSelection(3);
} else if (item.getUri() != null) {
mSpinner.setSelection(4);
} else {
mSpinner.setSelection(0);
}
} else {
mSpinner.setSelection(0);
}
}
if (clip != null) {
ClipData.Item item = clip.getItemAt(0);
switch (mSpinner.getSelectedItemPosition()) {
case 0:
mDataText.setText("(No data)");
break;
case 1:
mDataText.setText(item.getText());
break;
case 2:
mDataText.setText(item.getHtmlText());
break;
case 3:
mDataText.setText(item.getIntent().toUri(0));
break;
case 4:
mDataText.setText(item.getUri().toString());
break;
case 5:
mDataText.setText(item.coerceToText(this));
break;
case 6:
mDataText.setText(item.coerceToStyledText(this));
break;
case 7:
mDataText.setText(item.coerceToHtmlText(this));
break;
default:
mDataText.setText("Unknown option: " + mSpinner.getSelectedItemPosition());
break;
}
} else {
mDataText.setText("(NULL clip)");
}
mDataText.setMovementMethod(LinkMovementMethod.getInstance());
}
}