大三小学期 Android开发的一些经验

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

public class Award extends AppCompatActivity

改成

public class Award extends Activity

6.edittext提示为android：hint，edittext默认text为android：text

巴特西

大三小学期 Android开发的一些经验

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