常用控件

xiaoxiao2021-02-28 61

ProgressBar控件的xml <?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 android:id="@+id/pb_bar" style="?android:attr/progressBarStyleHorizontal" android:layout_width="match_parent" android:layout_height="wrap_content" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/tv_pb"/> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="下载" android:onClick="download"/> </LinearLayout> ProgressBar的Java代码 package com.example.app10; import android.os.Handler; import android.os.Message; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.ProgressBar; import android.widget.TextView; public class MainActivity extends AppCompatActivity { private ProgressBar pb_progressBar; private TextView tv_textView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); pb_progressBar = (ProgressBar)findViewById(R.id.pb_progressBar); tv_textView = (TextView) findViewById(R.id.tv_textView); } public void download(View view){ new MyThread().start(); } Handler handler=new Handler(){ @Override public void handleMessage(Message msg) { super.handleMessage(msg); int i=msg.what; tv_textView.setText(i+"%"); } }; class MyThread extends Thread{ @Override public void run() { super.run(); for (int i = 0; i <=100 ; i++) { pb_progressBar.setProgress(i); handler.sendEmptyMessage(i); if(i==50) { try { Thread.sleep(3000); } catch (InterruptedException e) { e.printStackTrace(); } }else{ try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } } } } } }

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.example.app9.MainActivity"> <ImageView android:layout_width="400dp" android:layout_height="400dp" android:id="@+id/img_main_img1" android:background="#6600ff00" /> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" > <RadioGroup android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" android:id="@+id/radio_rbs" > <RadioButton android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="1号佳丽" android:ems="3" /> <RadioButton android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="2号佳丽" android:ems="3" /> <RadioButton android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="3号佳丽" android:ems="3" /> <RadioButton android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="4号佳丽" android:ems="3" /> <RadioButton android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="5号佳丽" android:ems="3" /> <RadioButton android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="6号佳丽" android:ems="3" /> </RadioGroup> </LinearLayout> </LinearLayout> 第一种 package com.example.app9; import android.support.annotation.IdRes; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.widget.ImageView; import android.widget.RadioGroup; public class MainActivity extends AppCompatActivity { private ImageView img; private RadioGroup rbs; private int images[]={ R.drawable.s1,R.drawable.s2,R.drawable.s3,R.drawable.s4,R.drawable.s5,R.drawable.s6,R.drawable.s7 }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); img = (ImageView) findViewById(R.id.img_main_img1); rbs = (RadioGroup) findViewById(R.id.radio_rbs); //给ImageView设置初始图片 img.setImageResource(images[0]); rbs.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() { @Override public void onCheckedChanged(RadioGroup group, @IdRes int checkedId) { //切换图片 img.setImageResource(images[checkedId]); } }); } } 切换图片的效果图第二种方法用Environment类可以得到当前手机的一些信息，包括存储卡的信息 package com.example.app9; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.os.Environment; import android.support.annotation.IdRes; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.widget.ImageView; import android.widget.RadioGroup; import java.io.File; public class MainActivity extends AppCompatActivity { private ImageView img; private RadioGroup rbs; File[] files; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); img = (ImageView) findViewById(R.id.img_main_img1); rbs = (RadioGroup) findViewById(R.id.radio_rbs); //判断SD是否存在（如果你的手机支持SD扩展） if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){ //得到存储卡的位置 String s=Environment.getExternalStorageDirectory().getAbsolutePath(); File file=new File(s+"/images"); files=file.listFiles(); } Bitmap bm= BitmapFactory.decodeFile(files[0].getAbsolutePath()); img.setImageBitmap(bm); rbs.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() { @Override public void onCheckedChanged(RadioGroup group, @IdRes int checkedId) { //切换图片 Bitmap bm= BitmapFactory.decodeFile(files[checkedId].getAbsolutePath()); img.setImageBitmap(bm); } }); } }

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