项目冲刺：app加载界面

转自他人，但记不清了
public class ProgressView extends View {

    private RectF mRectF;
    private Paint mPaint;
    private int paintColor;//画笔颜色
    private int mStrokeWidth=8;//进度条圆弧宽度
    private float mMaxProgress=100;//最大进度条
    private float mProgress=0;

    public ProgressView(Context context)
    {
        this(context,null);
    }
    public ProgressView(Context context, @Nullable AttributeSet attrs)
    {
        this(context,attrs,0);
    }
    public ProgressView(Context context, @Nullable AttributeSet attrs, int defStyleAttr)
    {
        super(context,attrs,defStyleAttr);
        mRectF=new RectF();
        mPaint=new Paint();
    }

    @Override
    protected void onDraw(Canvas canvas)
    {
        super.onDraw(canvas);
        int width=this.getWidth();
        int height=this.getHeight();

        if(width!=height)
        {
            int min= Math.min(width,height);
            width=min;
            height=min;
        }

        // 位置
        mRectF.left=mStrokeWidth/2;
        mRectF.top=mStrokeWidth/2;
        mRectF.right=width-mStrokeWidth/2;
        mRectF.bottom=height-mStrokeWidth/2;

        //设置画布为透明
        canvas.drawColor(Color.TRANSPARENT);

        //画半个透明的圆当背景
        mPaint.setColor(Color.parseColor("#33000000"));
        mPaint.setStyle(Paint.Style.FILL);
        canvas.drawOval(mRectF,mPaint);

        //设置笔画
        mPaint.setAntiAlias(true);
        mPaint.setColor(paintColor);
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setStrokeWidth(mStrokeWidth);

        canvas.drawArc(mRectF,-90,-(mProgress/mMaxProgress)*360,false,mPaint);
    }

    /**
     * 设置画笔颜色
     * @param color
     */
    public void setPaintColor(String color)
    {
        paintColor= Color.parseColor(color);
    }

    /**
     * 设置最大进度的事件
     * @param time 倒计时时间  毫秒值
     */
    public void startDownTime(final long time,final OnFinishListener listener)
    {
        mMaxProgress=100;
        new Thread(new Runnable() {
            @Override
            public void run() {
                for(int i=(int)mMaxProgress;i>=0;i--)
                {
                    try {
                        Thread.sleep((long)(time/mMaxProgress));
                        //当倒计时结束时通知
                        if(i==0&&listener!=null)
                        {
                            post(new Runnable() {
                                @Override
                                public void run() {
                                    listener.onFinish();
                                }
                            });
                        }
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    mProgress=(float)i;
                    com.example.yunzhi.ProgressView.this.postInvalidate();
                }
            }
        }).start();
    }
}

public class Msg {
    public static final int TYPE_SENT = 1;
    public static final int TYPE_RECEIVED = 0;
    public String content;
    private int type;

    public Msg(String content, int type) {
        this.content = content;
        this.type = type;
    }

    public String getContent() {
        return content;
    }

    public int getType() {
        return type;
    }
}

　　

public class MsgAdapter extends RecyclerView.Adapter<MsgAdapter.ViewHolder>{

    private List<Msg> mMsgList;

    static class ViewHolder extends RecyclerView.ViewHolder {

        LinearLayout leftLayout;
        LinearLayout rightLayout;
        TextView leftMsg;
        TextView rightMsg;

        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            leftLayout = itemView.findViewById(R.id.left_layout);
            rightLayout = itemView.findViewById(R.id.right_layout);
            leftMsg = itemView.findViewById(R.id.left_msg);
            rightMsg = itemView.findViewById(R.id.right_msg);
        }
    }

    public MsgAdapter(List<Msg> mMsgList) {
        this.mMsgList = mMsgList;
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(viewGroup.getContext()).
                inflate(R.layout.msg_item, viewGroup, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder viewHolder, int i) {
        Msg msg = mMsgList.get(i);

        if (msg.getType() == Msg.TYPE_RECEIVED) {
            viewHolder.leftLayout.setVisibility(View.VISIBLE);
            viewHolder.rightLayout.setVisibility(View.GONE);
            viewHolder.leftMsg.setText(msg.getContent());
        } else {
            viewHolder.leftLayout.setVisibility(View.GONE);
            viewHolder.rightLayout.setVisibility(View.VISIBLE);
            viewHolder.rightMsg.setText(msg.getContent());
        }
    }

    @Override
    public int getItemCount() {
        return mMsgList.size();
    }
}

　　

public class SplashActivity extends AppCompatActivity {

    private ProgressView mProgressView;
    private RelativeLayout mRelEnter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_splash);

        getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);//隐藏状态栏
        ActionBar actionBar=getSupportActionBar();
        if(actionBar!=null) {
            actionBar.hide();
        }
        setContentView(R.layout.activity_splash);

        initView();
    }
    private void initView()
    {
        mRelEnter=(RelativeLayout)findViewById(R.id.rl_center);
        mProgressView=(ProgressView)findViewById(R.id.progress);

        //跳过点击事件
        mRelEnter.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                enterMain();
            }
        });

        //设置进度条颜色
        mProgressView.setPaintColor("#ff0000");
        //开始倒计时
        mProgressView.startDownTime(3500, new OnFinishListener() {
            @Override
            public void onFinish() {
                enterMain();
            }
        });
    }

    private void enterMain()
    {
        startActivity(new Intent(this,MainActivity.class));
        finish();
    }
}

　　

public interface OnFinishListener {
    void onFinish();
}