Android 动态设置布局属性
16lz
2021-01-23
Android在XML文件中写布局很方便, 但有时候不够灵活, 有时候我们需要动态添加View或者ViewGroup.
点击动态添加TextView:
private LinearLayout mLinearLayout; private int i = 1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mLinearLayout = (LinearLayout) findViewById(R.id.container); Button button = (Button) findViewById(R.id.button); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { TextView textView = new TextView(MainActivity.this); LinearLayout.LayoutParams tvLayoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT); textView.setLayoutParams(tvLayoutParams); textView.setText("动态添加的TextView" + "--" + i++); textView.setTextSize(TypedValue.COMPLEX_UNIT_SP, 20.0F); textView.setGravity(Gravity.CENTER); mLinearLayout.addView(textView); } }); }activity_main.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/container" android:layout_width="match_parent" android:layout_height="match_parent" android:divider="@drawable/divider_shape" android:orientation="vertical" android:showDividers="middle|end"> <Button android:id="@+id/button" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="添加" />LinearLayout>divider_shape.xml
<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android"> <size android:height="1dp" /> <solid android:color="@color/colorAccent" />shape>@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); LinearLayout linearLayout = new LinearLayout(this); //LayoutParams有多个, 注意看情况使用 LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT); linearLayout.setLayoutParams(layoutParams); linearLayout.setBackgroundColor(Color.GRAY); linearLayout.setOrientation(LinearLayout.HORIZONTAL); linearLayout.setGravity(Gravity.CENTER_VERTICAL); TextView textView = new TextView(this); LinearLayout.LayoutParams tvLayoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT); tvLayoutParams.weight = 1; //LinearLayout.LayoutParams 里有weight属性 textView.setLayoutParams(tvLayoutParams); textView.setText("动态添加的TextView"); //第一个参数可以指定单位, 如 TypedValue.COMPLEX_UNIT_SP代表SP //TypedValue.COMPLEX_UNIT_DIP 代表DP //TypedValue.COMPLEX_UNIT_PX 代表PX textView.setTextSize(TypedValue.COMPLEX_UNIT_SP, 20.0F); textView.setTextColor(Color.RED); textView.setGravity(Gravity.CENTER); textView.setBackgroundColor(Color.GREEN); ImageView imageView = new ImageView(this); LinearLayout.LayoutParams imageLayoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT); imageLayoutParams.leftMargin = 100; imageLayoutParams.rightMargin = 100; imageView.setLayoutParams(imageLayoutParams); imageView.setImageResource(R.mipmap.ic_launcher); linearLayout.addView(textView);//添加到ViewGroup中 linearLayout.addView(imageView);//添加到ViewGroup中 setContentView(linearLayout);
RelativeLayout的
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); RelativeLayout relativeLayout = new RelativeLayout(this); //LayoutParams有多个, 注意看情况使用 RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.MATCH_PARENT); relativeLayout.setLayoutParams(layoutParams); relativeLayout.setBackgroundColor(Color.GRAY); TextView textView = new TextView(this); RelativeLayout.LayoutParams tvLayoutParams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT); tvLayoutParams.addRule(RelativeLayout.CENTER_IN_PARENT);//addRule textView.setLayoutParams(tvLayoutParams); textView.setText("动态添加的TextView"); textView.setTextSize(TypedValue.COMPLEX_UNIT_SP, 20.0F); textView.setTextColor(Color.RED); textView.setGravity(Gravity.CENTER); textView.setBackgroundColor(Color.GREEN); ImageView imageView = new ImageView(this); RelativeLayout.LayoutParams imageLayoutParams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT); imageLayoutParams.addRule(RelativeLayout.ALIGN_PARENT_END); imageView.setLayoutParams(imageLayoutParams); imageView.setImageResource(R.mipmap.ic_launcher); ImageView imageView2 = new ImageView(this); RelativeLayout.LayoutParams imageLayoutParams2 = new RelativeLayout.LayoutParams (RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT); imageLayoutParams2.addRule(RelativeLayout.ALIGN_PARENT_END); imageLayoutParams2.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM); imageView2.setLayoutParams(imageLayoutParams2); imageView2.setImageResource(R.mipmap.ic_launcher); relativeLayout.addView(textView); relativeLayout.addView(imageView); relativeLayout.addView(imageView2); setContentView(relativeLayout); }
addRule支持如下属性
LayoutParams
可以看到, LayoutParams 前面有很多:
RelativeLayout.LayoutParams
LinearLayout.LayoutParams
ViewGroup.LayoutParams …
选择的时候主要是根据其父布局来选择.