TextView实现自动换行
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实现换行
replace和replaceAll的区别
1)replace的参数是char和CharSequence,即可以支持字符的替换,也支持字符串的替换(CharSequence即字符串序列的意思,说白了也就是字符串);
2)replaceAll的参数是regex,即基于规则表达式的替换,比如,可以通过replaceAll("\\d", "*")把一个字符串所有的数字字符都换成星号;
相同点是都是全部替换,即把源字符串中的某一字符或字符串全部换成指定的字符或字符串,如果只想替换第一次出现的,可以使用 replaceFirst(),这个方法也是基于规则表达式的替换,但与replaceAll()不同的是,只替换第一次出现的字符串;
另外,如果replaceAll()和replaceFirst()所用的参数据不是基于规则表达式的,则与replace()替换字符串的效果是一样的,即这两者也支持字符串的操作;
还有一点注意:执行了替换操作后,源字符串的内容是没有发生改变的.
举例如下:
String src = new String("ab43a2c43d"); System.out.println(src.replace("3","f"));=>ab4f2c4fd. System.out.println(src.replace('3','f'));=>ab4f2c4fd. System.out.println(src.replaceAll("\\d","f"));=>abffafcffd. System.out.println(src.replaceAll("a","f"));=>fb43fc23d. System.out.println(src.replaceFirst("\\d,"f"));=>abf32c43d System.out.println(src.replaceFirst("4","h"));=>abh32c43d.package webb.wechat;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.text.Editable;import android.text.TextWatcher;import android.view.View;import android.widget.AdapterView;import android.widget.ArrayAdapter;import android.widget.AutoCompleteTextView;import android.widget.Button;import android.widget.CheckBox;import android.widget.CompoundButton;import android.widget.LinearLayout;import android.widget.RadioButton;import android.widget.RadioGroup;import android.widget.RelativeLayout;import android.widget.SimpleAdapter;import android.widget.Spinner;import android.widget.TextView;import android.widget.Toast;import java.util.ArrayList;import java.util.HashMap;import java.util.List;public class MainActivity extends AppCompatActivity { private RadioGroup rgp; private LinearLayout linear1, linear2, linear3, linear4; //linear1 private RadioGroup linear1_rgp; private Button btn_linear_submit; //linear2 private LinearLayout linear2_cb; private CheckBox linear2_cb_all; private Button linear2_btn_del; //linear3 private Spinner spinner_sum; private Spinner spinner_sum_country; private RelativeLayout linear_countries; private static final String TEXT_KEY = "name"; private static final String IMAGE_KEY = "img"; //linear4 public List<Person> personList = new ArrayList<>(); private TextView linear4_tv; private Spinner nameOrlike; private AutoCompleteTextView auto_check; //国家集合 public List<HashMap<String, Object>> list = new ArrayList<>(); //城市集合 public List<HashMap<String, Object>> city_list_China = new ArrayList<>(); //空集合 public List<HashMap<String, Object>> city_list_null = new ArrayList<>(); //nameOrlike public String[] nameOrlikes; public String[] auto_name; public String[] auto_like; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //添加数据 addData(); //关联 initView(); //点击事件 initClick(); //绑定 initApp(); } private void initView() { //实例化 rgp = (RadioGroup) findViewById(R.id.rdg); linear1 = (LinearLayout) findViewById(R.id.linear1); linear1_rgp = (RadioGroup) findViewById(R.id.linear1_rgp); btn_linear_submit = (Button) findViewById(R.id.btn_OnSubmit); linear2 = (LinearLayout) findViewById(R.id.linear2); linear2_cb = (LinearLayout) findViewById(R.id.linear2_cb); linear2_cb_all = (CheckBox) findViewById(R.id.linear2_cb_all); linear2_btn_del = (Button) findViewById(R.id.linear2_btn_del); linear2_cb_all.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton compoundButton, boolean ischecked) { for (int i = 0; i < linear2_cb.getChildCount(); i++) { CheckBox cb = (CheckBox) linear2_cb.getChildAt(i); if (ischecked) { linear2_btn_del.setVisibility(View.VISIBLE); cb.setChecked(ischecked); } else { linear2_btn_del.setVisibility(View.GONE); cb.setChecked(ischecked); } } } }); linear3 = (LinearLayout) findViewById(R.id.linear3); spinner_sum = (Spinner) findViewById(R.id.spinner_sum); spinner_sum_country = (Spinner) findViewById(R.id.spinner_sum_country); linear_countries = (RelativeLayout) findViewById(R.id.linear_countries); linear4 = (LinearLayout) findViewById(R.id.linear4); linear4_tv = (TextView) findViewById(R.id.linear4_tv); nameOrlike = (Spinner) findViewById(R.id.nameOrlike); auto_check = (AutoCompleteTextView) findViewById(R.id.auto_check); } /** * 添加数据 */ private void addData() { //添加国家 HashMap<String, Object> hashMap = new HashMap<>(); hashMap.put(TEXT_KEY, "Afghanistan"); hashMap.put(IMAGE_KEY, R.mipmap.daxiao); list.add(hashMap); hashMap = new HashMap<>(); hashMap.put(TEXT_KEY, "Algeria"); hashMap.put(IMAGE_KEY, R.mipmap.fennu); list.add(hashMap); hashMap = new HashMap<>(); hashMap.put(TEXT_KEY, "Belarus"); hashMap.put(IMAGE_KEY, R.mipmap.ic_launcher); list.add(hashMap); hashMap = new HashMap<>(); hashMap.put(TEXT_KEY, "Ecuador"); hashMap.put(IMAGE_KEY, R.mipmap.shangxin); list.add(hashMap); hashMap = new HashMap<>(); hashMap.put(TEXT_KEY, "Ethiopia"); hashMap.put(IMAGE_KEY, R.mipmap.shuaku); list.add(hashMap); hashMap = new HashMap<>(); hashMap.put(TEXT_KEY, "France"); hashMap.put(IMAGE_KEY, R.mipmap.tiaopi); list.add(hashMap); hashMap = new HashMap<>(); hashMap.put(TEXT_KEY, "China"); hashMap.put(IMAGE_KEY, R.mipmap.weixiao); list.add(hashMap); //添加城市China HashMap<String, Object> city_China = new HashMap<>(); city_China.put(TEXT_KEY, "朝阳区"); city_China.put(IMAGE_KEY, R.mipmap.mei); city_list_China.add(city_China); city_China = new HashMap<>(); city_China.put(TEXT_KEY, "海淀区"); city_China.put(IMAGE_KEY, R.mipmap.you); city_list_China.add(city_China); city_China = new HashMap<>(); city_China.put(TEXT_KEY, "顺义区"); city_China.put(IMAGE_KEY, R.mipmap.tu); city_list_China.add(city_China); city_China = new HashMap<>(); city_China.put(TEXT_KEY, "昌平区"); city_China.put(IMAGE_KEY, R.mipmap.le); city_list_China.add(city_China); city_China = new HashMap<>(); city_China.put(TEXT_KEY, "通州区"); city_China.put(IMAGE_KEY, R.mipmap.meile); city_list_China.add(city_China); //添加城市Algeria HashMap<String, Object> city_Algeria = new HashMap<>(); //添加城市Ecuador HashMap<String, Object> city_Ecuador = new HashMap<>(); /** * Linear4 * 添加数据 */ Person p1 = new Person(); p1.name = "王伟旭"; p1.like = "篮球"; p1.age = "18"; p1.sex = "男"; p1.blood = "A型血"; personList.add(p1); Person p2 = new Person(); p2.name = "王伟旭"; p2.like = "羽毛球"; p2.age = "18"; p2.sex = "男"; p2.blood = "A型血"; personList.add(p2); Person p3 = new Person(); p3.name = "王伟旭"; p3.like = "羽毛球"; p3.age = "118"; p3.sex = "男"; p3.blood = "P型血"; personList.add(p3); //添加爱好/姓名 nameOrlikes = getResources().getStringArray(R.array.nameOrlike); auto_name = getResources().getStringArray(R.array.auto_name); auto_like = getResources().getStringArray(R.array.auto_like); } /** * 绑定国家 */ private void initApp() { SimpleAdapter adapter_countries = new SimpleAdapter( this, list, R.layout.countres_layout, new String[]{IMAGE_KEY, TEXT_KEY}, new int[]{R.id.iv_country_img, R.id.tv_country_name} ); spinner_sum.setAdapter(adapter_countries); //绑定城市 //绑定适配器爱好名字 ArrayAdapter<String> nameadapter = new ArrayAdapter<String>( this, R.layout.support_simple_spinner_dropdown_item, nameOrlikes ); nameOrlike.setAdapter(nameadapter); } private void initClick() { /** * linear4 * 选择爱好/姓名 */ nameOrlike.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { if (position == 0) { auto_check.setText(""); Toast.makeText(MainActivity.this, "姓名", Toast.LENGTH_SHORT).show(); add_adapter_name(); //显示详细信息 auto_check.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) { } String n = ""; @Override public void afterTextChanged(Editable s) { for (Person p : personList) { if (auto_check.getText().toString().equals(p.name)) {// Toast.makeText(MainActivity.this, "王伟旭", Toast.LENGTH_SHORT).show(); linear4_tv.setText(""); StringBuffer sb = new StringBuffer(); sb.append("姓名:" + p.name + "爱好:" + p.like + "年龄:" + p.age + "血型:" + p.blood + ";" + "\n"); Toast.makeText(MainActivity.this, sb, Toast.LENGTH_SHORT).show(); String name = sb.toString().replaceAll("\\n", "\n"); n = n + sb; linear4_tv.setText(n); } else { linear4_tv.setText(""); } } } }); } else { auto_check.setText(""); Toast.makeText(MainActivity.this, "爱好", Toast.LENGTH_SHORT).show(); add_adapter_like(); //显示详细信息 auto_check.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) { } String n = ""; @Override public void afterTextChanged(Editable s) { for (Person p : personList) { if (auto_check.getText().toString().equals(p.like)) {// Toast.makeText(MainActivity.this, "王伟旭", Toast.LENGTH_SHORT).show(); linear4_tv.setText(""); StringBuffer sb = new StringBuffer(); sb.append("姓名:" + p.name + "爱好:" + p.like + "年龄:" + p.age + "血型:" + p.blood + ";" + "\n"); Toast.makeText(MainActivity.this, sb, Toast.LENGTH_SHORT).show(); String name = sb.toString().replaceAll("\\n", "\n"); n = n + sb; linear4_tv.setText(n); } else { linear4_tv.setText(""); } } } }); } } private void add_adapter_name() { ArrayAdapter<String> adpter = new ArrayAdapter<String>( MainActivity.this, R.layout.support_simple_spinner_dropdown_item, auto_name ); auto_check.setAdapter(adpter); } private void add_adapter_like() { ArrayAdapter<String> adpter = new ArrayAdapter<String>( MainActivity.this, R.layout.support_simple_spinner_dropdown_item, auto_like ); auto_check.setAdapter(adpter); } @Override public void onNothingSelected(AdapterView<?> parent) { } }); //选择国家 spinner_sum.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { LinearLayout countres = (LinearLayout) view; TextView tv = (TextView) countres.getChildAt(1); System.out.println("明晚:" + tv.getText().toString()); if (tv.getText().equals("China")) { SimpleAdapter adapter_city = new SimpleAdapter( MainActivity.this, city_list_China, R.layout.countres_layout, new String[]{IMAGE_KEY, TEXT_KEY}, new int[]{R.id.iv_country_img, R.id.tv_country_name} ); spinner_sum_country.setAdapter(adapter_city); } else { SimpleAdapter adapter_city_null = new SimpleAdapter( MainActivity.this, city_list_null, R.layout.countres_layout, new String[]{IMAGE_KEY, TEXT_KEY}, new int[]{R.id.iv_country_img, R.id.tv_country_name} ); spinner_sum_country.setAdapter(adapter_city_null); } } @Override public void onNothingSelected(AdapterView<?> parent) { } }); rgp.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() { @Override public void onCheckedChanged(RadioGroup radioGroup, int ischecked) { for (int i = 0; i < rgp.getChildCount(); i++) { RadioButton rdo = (RadioButton) rgp.getChildAt(i); if (rdo.isChecked()) { switch (rdo.getId()) { case R.id.rdo_wechat: linear1.setVisibility(View.VISIBLE); linear2.setVisibility(View.GONE); linear3.setVisibility(View.GONE); linear4.setVisibility(View.GONE); break; case R.id.rdo_say: linear2.setVisibility(View.VISIBLE); linear1.setVisibility(View.GONE); linear3.setVisibility(View.GONE); linear4.setVisibility(View.GONE); break; case R.id.rdo_look: linear3.setVisibility(View.VISIBLE); linear2.setVisibility(View.GONE); linear1.setVisibility(View.GONE); linear4.setVisibility(View.GONE); break; case R.id.rdo_me: linear4.setVisibility(View.VISIBLE); linear2.setVisibility(View.GONE); linear3.setVisibility(View.GONE); linear1.setVisibility(View.GONE); break; } } } } }); linear1_rgp.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() { @Override public void onCheckedChanged(RadioGroup radioGroup, int ischecked) { for (int i = 0; i < linear1_rgp.getChildCount(); i++) { RadioButton rdo = (RadioButton) linear1_rgp.getChildAt(i); if (rdo.isChecked()) { btn_linear_submit.setVisibility(View.VISIBLE); } } } }); } //linear1 public void btn_OnSubmit(View view) { for (int i = 0; i < linear1_rgp.getChildCount(); i++) { RadioButton rdo = (RadioButton) linear1_rgp.getChildAt(i); if (rdo.isChecked()) { Toast.makeText(MainActivity.this, "哈哈哈" + rdo.getText().toString(), Toast.LENGTH_SHORT).show(); } } } public void cb_del(View view) { for (int i = 0; i < linear2_cb.getChildCount(); i++) { CheckBox checkBox = (CheckBox) linear2_cb.getChildAt(i); if (checkBox.isChecked()) { checkBox.setVisibility(View.GONE); } } }}阅读全文
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