Android该系统提供了一个水平进度条为我们展现了运行使用进展情况,水平进度条显示用于运行进度Clip Drawable技术
下面我们通过一个具体的例子来说明Clip Drawable使用。
还有我们要注意知识:
Clip0,此时是所有裁剪,图片看不见;
当级别为10000时,不裁剪图片,图片所有可见
程序执行结果:第一张为初始界面,第二张为点击5次界面,第三张为点击10的界面
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新建一个名称为:Clip Drawable的Android project。
程序结构文件夹:
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent"> <ImageView android:id="@+id/gril_img" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@drawable/clip" android:contentDescription="@string/app_name" /> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/Clip" android:onClick="change" android:layout_alignParentBottom="true" android:layout_centerHorizontal="true" android:layout_marginBottom="20dp"/> </RelativeLayout>
clip.xml
<?xml version="1.0" encoding="utf-8"?> <clip xmlns:android="http://schemas.android.com/apk/res/android" android:drawable="@drawable/girl" android:clipOrientation="horizontal" android:gravity="left" > </clip>
strings.xml
<?xml version="1.0" encoding="utf-8"?> <resources> <string name="app_name">ClipDrawable</string> <string name="hello_world">Hello world!</string> <string name="action_settings">Settings</string> <string name="Clip">clip</string> </resources>
MainActivity.java
package com.shen.clipdrawable; import android.support.v7.app.ActionBarActivity; import android.graphics.drawable.ClipDrawable; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.ImageView; public class MainActivity extends ActionBarActivity { private ImageView imageView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // 获取Imageview控件 imageView = (ImageView) findViewById(R.id.gril_img); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } public void change(View v) { // 获得ClipDrawable对象 ClipDrawable clipDrawable = (ClipDrawable) imageView.getBackground(); // 设置裁剪级别,Clip类型的图片默认裁剪级别为0。此时是所有裁剪。图片看不见; // 当级别为10000时。不裁剪图片,图片所有可见 // 当所有显示后。设置不可见 if (10000 == clipDrawable.getLevel()) { clipDrawable.setLevel(0); } else { clipDrawable.setLevel(clipDrawable.getLevel() + 1000); } } }
程序中用的资源图片:
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时间: 2024-11-10 15:27:39