自定义View实现图片上传进度显示
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转载jssyy123的文章,感谢其无私的奉献!
首先看下我们想要实现的效果如下图(qq聊天中发送图片时的效果):
再看一下我实现的效果:
1、效果已经看见了,下面我们来实现它。首先我创建一个android工程ProgressImageView。然后我们重写ImageView控件,创建ProcessImageView类代码如下:
- package com.example.processimageview;
-
- import android.annotation.SuppressLint;
- import android.content.Context;
- import android.graphics.Canvas;
- import android.graphics.Color;
- import android.graphics.Paint;
- import android.graphics.Rect;
- import android.util.AttributeSet;
- import android.view.ViewGroup.LayoutParams;
- import android.widget.ImageView;
-
- public class ProcessImageView extends ImageView {
-
- private Paint mPaint;
- int width = 0;
- int height = 0;
- Context context = null;
- int progress = 0;
-
- public ProcessImageView(Context context) {
- super(context);
-
- }
-
- public ProcessImageView(Context context, AttributeSet attrs) {
- this(context, attrs, 0);
- }
-
- public ProcessImageView(Context context, AttributeSet attrs,
- int defStyleAttr) {
- super(context, attrs, defStyleAttr);
- this.context = context;
- mPaint = new Paint();
- }
-
- @SuppressLint("DrawAllocation")
- @Override
- protected void onDraw(Canvas canvas) {
- super.onDraw(canvas);
- mPaint.setAntiAlias(true);
- mPaint.setStyle(Paint.Style.FILL);
-
-
- mPaint.setColor(Color.parseColor("#70000000"));
- canvas.drawRect(0, 0, getWidth(), getHeight()- getHeight() * progress
- / 100, mPaint);
-
- mPaint.setColor(Color.parseColor("#00000000"));
- canvas.drawRect(0, getHeight() - getHeight() * progress / 100,
- getWidth(), getHeight(), mPaint);
-
- mPaint.setTextSize(30);
- mPaint.setColor(Color.parseColor("#FFFFFF"));
- mPaint.setStrokeWidth(2);
- Rect rect = new Rect();
- mPaint.getTextBounds("100%", 0, "100%".length(), rect);
- canvas.drawText(progress + "%", getWidth() / 2 - rect.width() / 2,
- getHeight() / 2, mPaint);
-
- }
-
- public void setProgress(int progress) {
- this.progress = progress;
- postInvalidate();
- };
-
- }
2、将ProcessImageView控件加入activity_layout.xml布局文件中,代码如下;
- <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"
- android:paddingBottom="@dimen/activity_vertical_margin"
- android:paddingLeft="@dimen/activity_horizontal_margin"
- android:paddingRight="@dimen/activity_horizontal_margin"
- android:paddingTop="@dimen/activity_vertical_margin"
- tools:context="com.example.processimageview.MainActivity" >
-
- <com.example.processimageview.ProcessImageView
- android:id="@+id/image"
- android:layout_centerInParent = "true"
- android:layout_width="200dp"
- android:layout_height="300dp"
- android:contentDescription="This is a ProcessImage"
- android:src="@drawable/image" />
-
- </RelativeLayout>
3、最后一步,显示效果,在MainActivity类加入显示进度条的ImageView,代码如下:
- package com.example.processimageview;
-
- import android.app.Activity;
- import android.os.Bundle;
- import android.os.Handler;
- import android.os.Message;
- import android.view.Menu;
- import android.view.MenuItem;
- import android.view.View;
- import android.view.ViewGroup.LayoutParams;
- import android.widget.Toast;
-
- public class MainActivity extends Activity {
-
- ProcessImageView processImageView =null;
- private final int SUCCESS=0;
- int progress=0;
-
- Handler handler=new Handler(){
- @Override
- public void handleMessage(Message msg) {
- super.handleMessage(msg);
- switch (msg.what) {
- case SUCCESS:
- Toast.makeText(MainActivity.this, "图片上传完成", Toast.LENGTH_SHORT).show();
- processImageView.setVisibility(View.GONE);
- break;
- }
- }
- };
-
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
-
- processImageView=(ProcessImageView) findViewById(R.id.image);
-
- new Thread(new Runnable() {
- @Override
- public void run() {
- while (true){
- if(progress==100){
- handler.sendEmptyMessage(SUCCESS);
- return;
- }
- progress++;
- processImageView.setProgress(progress);
- try{
- Thread.sleep(200);
- } catch (InterruptedException e){
- e.printStackTrace();
- }
- }
- }
- }).start();
- }
-
- @Override
- public boolean onCreateOptionsMenu(Menu menu) {
-
- getMenuInflater().inflate(R.menu.main, menu);
- return true;
- }
-
- @Override
- public boolean onOptionsItemSelected(MenuItem item) {
-
-
-
- int id = item.getItemId();
- if (id == R.id.action_settings) {
- return true;
- }
- return super.onOptionsItemSelected(item);
- }
- }
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