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本篇文章为大家展示了如何在Android中使用显示全文折叠控件,内容简明扼要并且容易理解,绝对能使你眼前一亮,通过这篇文章的详细介绍希望你能有所收获。
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布局文件:
很简单,上面的TextView显示主要的文本内容,下面的就是折叠的时候点击的。
下面是自定义。
package xxx; import android.annotation.SuppressLint; import android.content.Context; import android.os.Handler; import android.os.Message; import android.util.AttributeSet; import android.view.View; import android.widget.LinearLayout; import android.widget.TextView; import android.widget.TextView.BufferType; import xxx.R; /** * 查看全文控件 */ public class CollapsibleTextView extends LinearLayout implements View.OnClickListener { private static final int COLLAPSIBLE_STATE_NONE = 0;// 不显示 private static final int COLLAPSIBLE_STATE_SHRINKUP = 1;// 显示收起 private static final int COLLAPSIBLE_STATE_SPREAD = 2;// 显示全文 private int mState = COLLAPSIBLE_STATE_SPREAD; private static final String COLLAPSIBLE_STATE_SHRINKUP_TEXT = "收起"; private static final String COLLAPSIBLE_STATE_SPREAD_TEXT = "全文"; private TextView mText; /** * @return Returns the mText. */ public TextView getmText() { return mText; } public int getmState() { return mState; } public void setmState(int mState) { this.mState = mState; } private TextView mTextTip; private changeState changeStateCallBack; private boolean isNeedLayout; private int maxLineCount = 8; private final Handler handler = new Handler() { @Override public void dispatchMessage(Message msg) { if (mText.getLineCount() <= maxLineCount) { // 行数不足不做处理 mState = COLLAPSIBLE_STATE_NONE; mText.setMaxLines(Integer.MAX_VALUE); mTextTip.setVisibility(View.GONE); } else { switch (mState) { case COLLAPSIBLE_STATE_SPREAD: // 全文状态 mText.setMaxLines(maxLineCount); mTextTip.setVisibility(View.VISIBLE); mTextTip.setText(COLLAPSIBLE_STATE_SPREAD_TEXT); break; case COLLAPSIBLE_STATE_SHRINKUP: // 收起状态 mText.setMaxLines(Integer.MAX_VALUE); mTextTip.setVisibility(View.VISIBLE); mTextTip.setText(COLLAPSIBLE_STATE_SHRINKUP_TEXT); break; default: // 除非发生不可知状态,一般不会执行到这个 mState = COLLAPSIBLE_STATE_NONE; mText.setMaxLines(Integer.MAX_VALUE); mTextTip.setVisibility(View.GONE); break; } } } }; public CollapsibleTextView(Context context) { this(context, null); initView(); } public CollapsibleTextView(Context context, AttributeSet attrs) { super(context, attrs); initView(); } @SuppressLint("NewApi") public CollapsibleTextView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); initView(); } private void initView() { View view = inflate(getContext(), R.layout.collapsible_textview, this); view.setPadding(0, -1, 0, 0); mText = (TextView) view.findViewById(R.id.desc_tv); mTextTip = (TextView) view.findViewById(R.id.desc_op_tv); mTextTip.setOnClickListener(this); } /** * 设置文本 * * @param charSequence * @param bufferType */ public final void setText(CharSequence charSequence, BufferType bufferType) { isNeedLayout = true; mState = COLLAPSIBLE_STATE_SPREAD; mText.setText(charSequence, bufferType); } /** * 设置文本 * * @param charSequence */ public final void setText(CharSequence charSequence) { isNeedLayout = true; mText.setText(charSequence); } @Override public void onClick(View v) { isNeedLayout = true; if (mState == COLLAPSIBLE_STATE_SPREAD) { // 如果是全文状态,就改成收起状态 mState = COLLAPSIBLE_STATE_SHRINKUP; requestLayout(); } else if (mState == COLLAPSIBLE_STATE_SHRINKUP) { // 如果是收起状态,就改成全文状态 mState = COLLAPSIBLE_STATE_SPREAD; requestLayout(); } if (null != changeStateCallBack) { changeStateCallBack.changeFlag(v); } } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { super.onLayout(changed, l, t, r, b); if (isNeedLayout) { isNeedLayout = false; handler.sendMessage(Message.obtain()); } } public int getMaxLineCount() { return maxLineCount; } public void setMaxLineCount(int maxLineCount) { this.maxLineCount = maxLineCount; } public changeState getChangeStateCallBack() { return changeStateCallBack; } public void setChangeStateCallBack(changeState changeStateCallBack) { this.changeStateCallBack = changeStateCallBack; } public interface changeState { public void changeFlag(View v); } }
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