大三小学期 Android开发的一些经验 _Android开发

一卷旌收千骑虏，万全身出百重围。这篇文章主要讲述大三小学期 Android开发的一些经验相关的知识，希望能为你提供帮助。
1.同一个TextView几种颜色的设置：

build=(TextView)findViewById(R.id.building); SpannableStringBuilder style = new SpannableStringBuilder("建筑物名称*"); style.setSpan(new ForegroundColorSpan(Color.BLACK), 0, 5, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); style.setSpan(new ForegroundColorSpan(Color.RED), 5, 6, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); build.setText(style);

显示出来就是：建筑物名称* 2.判断输入不为空：

//建筑物名称不能为空 building.addTextChangedListener(new TextWatcher() { @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) {}@Override public void onTextChanged(CharSequence s, int start, int before, int count) { if(TextUtils.isEmpty(building.getText())||TextUtils.isEmpty(floor.getText()) ||TextUtils.isEmpty(telephone.getText())||TextUtils.isEmpty(description.getText())) { upload.setEnabled(false); Toast.makeText(Feedback.this,"请完成反馈信息的填写",Toast.LENGTH_LONG).show(); } else { upload.setEnabled(true); }}@Override public void afterTextChanged(Editable s) {} });

3.两个界面之间传递值，值为double类型：发送方：

Intent intent = new Intent(selectPoint.this,Feedback.class); intent.putExtra("latitude",latitude); intent.putExtra("longtitude",longtitude); startActivity(intent);

接收方：

Intent intent=getIntent(); final double longtitude = intent.getDoubleExtra("longtitude",0); final double latitude = intent.getDoubleExtra("latitude",0);

4.设置app开头动态效果（转自：http://blog.csdn.net/nmsoftklb/article/details/12943483）

public class Welcome extends AppCompatActivity { private ImageView welcome; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_welcome); welcome = (ImageView) this.findViewById(R.id.welcome); AlphaAnimation anima = new AlphaAnimation(0.3f, 1.0f); anima.setDuration(3000); // 设置动画显示时间 welcome.startAnimation(anima); anima.setAnimationListener(new AnimationImpl()); }private class AnimationImpl implements Animation.AnimationListener {@Override public void onAnimationStart(Animation animation) { welcome.setBackgroundResource(R.drawable.welcome); }@Override public void onAnimationEnd(Animation animation) { skip(); // 动画结束后跳转到别的页面 }@Override public void onAnimationRepeat(Animation animation) {}}private void skip() { startActivity(new Intent(this, Feedback.class)); finish(); } }

5.去掉界面上面的蓝色默认的头