常用控件（三）

进度条和抠图以及获取手机内存卡的图片

先写3个xml文件

1.

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical" android:layout_width="match_parent"    android:layout_height="match_parent">    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal"        >        <Button            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="&lt;"            android:onClick="before"            />        <Button            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="+"            android:onClick="add"            />        <Button            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="-"            android:onClick="delete"            />        <Button            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="&gt;"            android:onClick="next"            />    </LinearLayout>    <ImageView        android:layout_width="300dp"        android:layout_height="400dp"        android:id="@+id/iv_girl_image"        android:background="#ffff00"        />    <ImageView        android:layout_width="60dp"        android:layout_height="60dp"        android:id="@+id/iv_girl_new"        /></LinearLayout>

2.

<?xml version="1.0" encoding="utf-8"?><LinearLayout 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"    tools:context="com.zking.g160618_android06_widget.MainActivity">    <ImageView        android:layout_width="60dp"        android:layout_height="60dp"        android:background="#00ff00"        android:scaleType="centerInside"        android:src="@drawable/largeimage"        />    <ImageView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:src="@drawable/largeimage"        /></LinearLayout>

3.

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical" android:layout_width="match_parent"    android:layout_height="match_parent">    <ProgressBar        style="?android:attr/progressBarStyleHorizontal"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/progressBar"        />    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/tv_progress_num"        android:textSize="30sp"        />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:onClick="start"        android:text="开始"        /></LinearLayout>

下面是java代码

首先是抠图，就是图片局部放大

package com.zking.g160618_android06_widget;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Bundle;import android.os.Environment;import android.support.annotation.Nullable;import android.support.v7.app.AppCompatActivity;import android.util.Log;import android.view.MotionEvent;import android.view.View;import android.widget.ImageView;import android.widget.Toast;import java.io.File;/** * @author Zking-Snail * @time 2017/6/9 11:40 * @Version ${REV} */public class GirlActivity extends AppCompatActivity{    //定义图片数组    private int images[]={R.drawable.s1,R.drawable.s2,R.drawable.s3,R.drawable.s4,R.drawable.s5};    private ImageView iv_girl_image;    private int currentIndex=0;    private int currentAlpha=255;    private File[] files;    private ImageView iv_girl_new;    private Bitmap bitmap;    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_girl);        iv_girl_image = (ImageView) findViewById(R.id.iv_girl_image);        iv_girl_new = (ImageView) findViewById(R.id.iv_girl_new);        //获取手机内存卡中的图片        if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){            //获取内存卡的路径            String sdcardPath=Environment.getExternalStorageDirectory().getAbsolutePath();            File file=new File(sdcardPath+"/images");            files = file.listFiles();        }        //通过代码指定第一张默认图片        //iv_girl_image.setImageResource(images[currentIndex]);        bitmap = BitmapFactory.decodeFile(files[currentIndex].getAbsolutePath());        iv_girl_image.setImageBitmap(bitmap);        //设置透明度        iv_girl_image.setImageAlpha(currentAlpha);        //给ImageView设置触摸事件        iv_girl_image.setOnTouchListener(new View.OnTouchListener() {            @Override            public boolean onTouch(View view, MotionEvent motionEvent) {                //获取手指的坐标                float x=motionEvent.getX();                float y=motionEvent.getY();                //抠图                Bitmap newBitmap=Bitmap.createBitmap(bitmap,(int)x,(int)y,30,30);                iv_girl_new.setImageBitmap(newBitmap);                return true;            }        });    }    public void before(View view){        currentIndex--;        //Log.i("test","当前值："+currentIndex);        if(currentIndex<0){            currentIndex=0;            Toast.makeText(GirlActivity.this, "兄弟,乖乖充会员吧！", Toast.LENGTH_SHORT).show();        }        //iv_girl_image.setImageResource(images[currentIndex]);        bitmap=BitmapFactory.decodeFile(files[currentIndex].getAbsolutePath());        iv_girl_image.setImageBitmap(bitmap);    }    public void next(View view){        currentIndex++;        //Log.i("test","当前值："+currentIndex);        if(currentIndex>=files.length){            currentIndex=files.length-1;            Toast.makeText(GirlActivity.this, "兄弟,请冲会员,查看更多", Toast.LENGTH_SHORT).show();        }        //iv_girl_image.setImageResource(images[currentIndex]);        bitmap=BitmapFactory.decodeFile(files[currentIndex].getAbsolutePath());        iv_girl_image.setImageBitmap(bitmap);    }    public void add(View view){        currentAlpha+=20;        if(currentAlpha>255){            currentAlpha=255;            Toast.makeText(GirlActivity.this, "兄弟，很高清了", Toast.LENGTH_SHORT).show();        }        iv_girl_image.setImageAlpha(currentAlpha);    }    public void delete(View view){        currentAlpha-=20;        if(currentAlpha<0){            currentAlpha=0;            Toast.makeText(GirlActivity.this, "兄弟，没得看了", Toast.LENGTH_SHORT).show();        }        iv_girl_image.setImageAlpha(currentAlpha);    }}

获取手机内存卡的路径还需要在 AndroidManifest.xml写代码

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.a_02.a_06">    <!--获取内存卡的权限-->    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>    <application android:allowBackup="true" android:icon="@mipmap/ic_launcher"        android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round"        android:supportsRtl="true" android:theme="@style/AppTheme">        <activity android:name=".MainActivity">        </activity>        <activity android:name=".test">        </activity>      <activity android:name=".work">          <intent-filter>              <action android:name="android.intent.action.MAIN" />              <category android:name="android.intent.category.LAUNCHER" />          </intent-filter>      </activity>    </application></manifest>

然后到进度条了

package com.zking.g160618_android06_widget;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.support.annotation.Nullable;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.ProgressBar;import android.widget.TextView;/** * @author Zking-Snail * @time 2017/6/11 11:11 * @Version ${REV} */public class ProgressActivity extends AppCompatActivity {    private ProgressBar progressBar;    private TextView tv_progress_num;    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_progress);        progressBar = (ProgressBar) findViewById(R.id.progressBar);        tv_progress_num = (TextView) findViewById(R.id.tv_progress_num);    }    //ANR ：application not responsing应用程序无响应    //why：因为在主线程中执行了 耗时的操作    //how:把耗时的操作 写到子线程中    public void start(View view){        new MyThread().start();    }    Handler handler=new Handler(){        //接受消息，并更新UI        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            //接受消息            int i=msg.what;//            更新UI            tv_progress_num.setText(i+"%");        }    };    class MyThread extends Thread{        @Override        public void run() {            super.run();            for (int i = 0; i <=100 ; i++) {                progressBar.setProgress(i);                //发消息                handler.sendEmptyMessage(i);                try {                    Thread.sleep(100);                } catch (InterruptedException e) {                    e.printStackTrace();                }            }        }    }}

这里要
注意耗时的事件不要写道主线程中，会导致程序无响应