實現：TextView自由複製功能

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原始碼已經上傳，連結地址：http://download.csdn.net/detail/huangyabin001/7556825點擊開啟連結

package com.example.copyfree;import android.app.ActionBar;import android.app.Activity;import android.app.AlertDialog;import android.app.AlertDialog.Builder;import android.content.DialogInterface;import android.content.DialogInterface.OnClickListener;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.text.TextUtils;import android.text.method.HideReturnsTransformationMethod;import android.util.TypedValue;import android.view.GestureDetector;import android.view.Menu;import android.view.MenuItem;import android.view.MotionEvent;import android.view.ScaleGestureDetector;import android.view.View;import android.widget.EditText;import android.widget.TextView;import android.widget.Toast;public class CopyFreeActivity extends Activity {private static final String TAG = "SelectTextToCopyActivity";private float mScaleFactor = 1;private ScaleGestureDetector mScaleDetector;private GestureDetector mGestureDetector;private TextView text;private EditText edit;private static final int ZOOM_IN = 4;private static final int ZOOM_OUT = 5;private final int MAX_ZOOM_IN_SIZE = 60;private final int MAX_ZOOM_OUT_SIZE = 20;private final int THE_SIZE_OF_PER_ZOOM = 9;private float mTextSize = 27;private int mZoomMsg = -1;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_copy_free);initUi();}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {return true;}public void button(View view) {if (TextUtils.isEmpty(edit.getText())) {Toast.makeText(this, "請輸入測試內容！", 0).show();} elsetext.setText(edit.getText());}@Overridepublic boolean onSearchRequested() {return false;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {switch (item.getItemId()) {case android.R.id.home:AlertDialog.Builder dialog = new AlertDialog.Builder(this);dialog.setTitle("Exit").setIcon(android.R.drawable.btn_star).setMessage("立即退出程式？").setPositiveButton("確定", new OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {CopyFreeActivity.this.finish();}}).setNegativeButton("取消", new OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {dialog.cancel();}}).show();break;}return super.onOptionsItemSelected(item);}private void initUi() {text = (TextView) findViewById(R.id.text);edit = (EditText) findViewById(R.id.edit);text.setTransformationMethod(HideReturnsTransformationMethod.getInstance());text.setTextIsSelectable(true);mScaleDetector = new ScaleGestureDetector(this, new MyScaleListener());mGestureDetector = new GestureDetector(this,new GestureDetector.SimpleOnGestureListener() {});mGestureDetector.setOnDoubleTapListener(null);ActionBar actionBar = getActionBar();actionBar.setDisplayHomeAsUpEnabled(true);}private Handler mUiHandler = new Handler() {@Overridepublic void handleMessage(Message msg) {switch (msg.what) {case ZOOM_IN:zoomIn();text.invalidate();break;case ZOOM_OUT:zoomOut();text.invalidate();//修改TextView後，調用該方法重新整理TextView，這樣才能看到重新繪製的介面。break;default:break;}}};private void zoomIn() {mTextSize = mTextSize + THE_SIZE_OF_PER_ZOOM <= MAX_ZOOM_IN_SIZE ? mTextSize+ THE_SIZE_OF_PER_ZOOM: MAX_ZOOM_IN_SIZE;if (mTextSize >= MAX_ZOOM_IN_SIZE) {mTextSize = MAX_ZOOM_IN_SIZE;}text.setTextSize(TypedValue.COMPLEX_UNIT_PX, mTextSize);}private void zoomOut() {mTextSize = mTextSize - THE_SIZE_OF_PER_ZOOM < MAX_ZOOM_OUT_SIZE ? MAX_ZOOM_OUT_SIZE: mTextSize - THE_SIZE_OF_PER_ZOOM;if (mTextSize <= MAX_ZOOM_OUT_SIZE) {mTextSize = MAX_ZOOM_OUT_SIZE;}text.setTextSize(TypedValue.COMPLEX_UNIT_PX, mTextSize);}private class MyScaleListener extendsScaleGestureDetector.SimpleOnScaleGestureListener {@Overridepublic boolean onScale(ScaleGestureDetector detector) {float scale = detector.getScaleFactor();if (scale < 0.999999 || scale > 1.00001) {mScaleFactor = scale;}return true;}@Overridepublic boolean onScaleBegin(ScaleGestureDetector detector) {return true;}@Overridepublic void onScaleEnd(ScaleGestureDetector detector) {float scale = detector.getScaleFactor();if (mScaleFactor > 1.0) {mZoomMsg = ZOOM_IN;} else if (mScaleFactor < 1.0) {mZoomMsg = ZOOM_OUT;}}}public boolean onInterceptTouchEvent(MotionEvent ev) {mScaleDetector.onTouchEvent(ev);final int action = ev.getAction();switch (action) {case MotionEvent.ACTION_DOWN:mGestureDetector.onTouchEvent(ev);return false;case MotionEvent.ACTION_MOVE:mGestureDetector.onTouchEvent(ev);return false;case MotionEvent.ACTION_UP:mGestureDetector.onTouchEvent(ev);Message msg = Message.obtain();msg.what = mZoomMsg;mUiHandler.sendMessage(msg);mZoomMsg = -1;return false;}return true;}public boolean onTouchEvent(MotionEvent ev) {mScaleDetector.onTouchEvent(ev);final int action = ev.getAction();switch (action) {case MotionEvent.ACTION_DOWN:mGestureDetector.onTouchEvent(ev);return true;case MotionEvent.ACTION_MOVE:mGestureDetector.onTouchEvent(ev);return true;case MotionEvent.ACTION_UP:mGestureDetector.onTouchEvent(ev);Message msg = Message.obtain();msg.what = mZoomMsg;mUiHandler.sendMessage(msg);mZoomMsg = -1;return true;case MotionEvent.ACTION_CANCEL:mGestureDetector.onTouchEvent(ev);return true;default:if (mGestureDetector.onTouchEvent(ev)) {return true;}return true;}}@Overrideprotected void onDestroy() {super.onDestroy();mUiHandler.removeCallbacksAndMessages(null);}}